[31]:3031 The evolution of this lineage is characterized by the increase of serrations, the widening of the crown, the development of a more triangular shape, and the disappearance of the lateral cusps. No tracking or performance measurement cookies were served with this page. This aggressive but slow-moving fish dominates feeding frenzies, and is a danger to survivors of oceanic shipwrecks and downed aircraft it has attacked more Sharks shed their teeth frequently throughout throughout their life as they grew or the teeth became worn. Why not join us today? WebBook List. For instance, without an adequate amount of sunlight, autotrophic organisms may not be able to survive. Its a well established fact that sharks are feeding machines so their teeth often have adaptations that make killing and eating prey easier. [10] Sharks with needle-like teeth commonly feed on small to medium-sized fish, sometimes including small sharks. These teeth, from Carcharodon sp. Jeremiah pointed out that the jaw perimeter of a shark is directly proportional to its total length, with the width of the roots of the largest teeth being a tool for estimating jaw perimeter. These adaptations often take place in crown shape and level of serration. This was the first common style of shark tooth, present in the Devonian, four hundred million years ago. [56][40] Using this tooth height regression equation, the authors estimated a total length of 15.9 meters (52ft) based on a tooth 16.8 centimeters (6.6in) tall, which the authors considered a conservative maximum estimate. [83] By the Late Miocene, around 11Mya, macroraptorials experienced a significant decline in abundance and diversity. We will guide you on how to place your essay help, proofreading and editing your draft fixing the grammar, spelling, or formatting of your paper easily and cheaply. Using these differences, we can track shark lineages by changes in tooth shape and structure. These include producers, consumers, decomposers and detritivores. Because shark teeth undergo permineralization they are susceptible to being colored by whatever minerals leach into them from their surroundings. Rhinoceros: Weighs up to 2,800kg and second largest animal after the elephant; irritable, and charges with long, sharp horns up to 64km an hour when WebPinnipeds (pronounced / p n p d z /), commonly known as seals, are a widely distributed and diverse clade of carnivorous, fin-footed, semiaquatic, mostly marine mammals.They comprise the extant families Odobenidae (whose only living member is the walrus), Otariidae (the eared seals: sea lions and fur seals), and Phocidae (the earless Generally speaking, newer teeth will still be white, or slightly off-white. WebSee how NASAs new Mars rover will explore the red planet [14], In 2020, Cooper and his colleagues reconstructed a 2D model of megalodon based on the dimensions of all the extant lamnid sharks and suggested that a 16 meters (52ft) long megalodon would have had a 4.65m (15.3ft) long head, 1.41m (4ft 8in) tall gill slits, a 1.62m (5ft 4in) tall dorsal fin, 3.08m (10ft 1in) long pectoral fins, and a 3.85m (12ft 8in) tall tail fin. [60], The most common fossils of megalodon are its teeth. Great White Shark: Most aggressive shark towards humans; charges at prey up to 40km an hour before taking a large bite; humans die from blood loss in 20 percent of cases; 2 deaths. IT's estimated that some species shed an average of 35,000 teeth in their lifetime. [40][66] As with all sharks, the skeleton of megalodon was formed of cartilage rather than bone; consequently most fossil specimens are poorly preserved. A cooling trend starting in the Oligocene 35Mya ultimately led to glaciation at the poles. While scavenging behavior cannot be ruled out as a possibility, the placement of the bite marks is more consistent with predatory attacks than feeding by scavenging, as the jaw is not a particularly nutritious area to for a shark feed or focus on. This research may uncover many different aspects about the tooth itself, and the shark species. google_ad_client = "ca-pub-4643150179421087"; Like Brygmophyseter, it had a relatively small crown, making up only 18% of the tooth. Enjoy lots more interesting lion information with these fun facts. Such preferences may have developed shortly after they appeared in the Oligocene. [33] Lateral cusplets were finally lost in a gradual process that took roughly 12 million years during the transition between C. chubutensis and C. WebHowStuffWorks explains thousands of topics, from engines to lock-picking to ESP, with video and illustrations so you can learn how everything works. WebTheir teeth also contain many pressure sensitive nerves. Fossil megalodon teeth can vary in color from off-white to dark browns and greys, and some fossil teeth may have been redeposited into a younger stratum. As well as being a famous Looney Tunes character, the Tasmanian Devil is a real animal that is only found in the wild in Tasmania, Australia. Unlike the great white, which attacks prey from the soft underside, megalodon probably used its strong jaws to break through the chest cavity and puncture the heart and lungs of its prey. The major culprits are groundwater seepage and plant and animal interference. WebOtodus megalodon teeth are the largest of any shark, extinct or living, and are among the most sought after types of shark teeth in the world. The fossil is also notable as it stands as the first known instance of an antagonistic interaction between a sperm whale and an otodontid shark recorded in the fossil record. [31]:33[70], Fossil remains show a trend for specimens to be larger on average in the Southern Hemisphere than in the Northern, with mean lengths of 11.6 and 9.6 meters (38 and 31ft), respectively; and also larger in the Pacific than the Atlantic, with mean lengths of 10.9 and 9.5 meters (36 and 31ft) respectively. megalodon. This shark lived during the late Oligocene epoch and Neogene period, about 28 to 1.5 million years ago, and ranged to a maximum length of 60ft.[13] The smallest teeth are only 1.2cm (0.5in) in height, while the largest teeth are in excess of 17.7cm (7.0in). The oldest known records of fossilized shark teeth are by Pliny the Elder, who believed that these triangular objects fell from the sky during lunar eclipses. Great White Shark: Most aggressive shark towards humans; charges at prey up to 40km an hour before taking a large bite; humans die from blood loss in 20 percent of cases; 2 deaths. (2016),[6] Ehret et al, (2009),[29] and the findings of Siversson et al. These sharks filter feed on prey by opening their mouths to let tiny organisms get sucked into their mouths to feed without using their teeth at all, instead filtering the food when passing water through their gills. However, the largest contemporary ectothermic sharks, such as the whale shark, are filter feeders, while lamnids are now known to be regional endotherms, implying some metabolic correlations with a predatory lifestyle. For instance, abiotic components in a terrestrial ecosystem include air, weather, water, temperature, humidity, altitude, the pH level of soil, type of soil and more. These considerations, as well as tooth oxygen isotopic data and the need for higher burst swimming speeds in macropredators of endothermic prey than ectothermy would allow, imply that otodontids, including megalodon, were probably regional endotherms. Insects such as bees, mosquitoes and cicadas make noise by rapidly moving their wings. That's 200 million years before the dinosaurs! Among the very largest of sharks, the Great White regularly reaches a length of 20 feet and a weight of more than two tons. Therefore, surrounding minerals are directly responsible for the coloring of the tooth. Sharks have a complex electro-sensory system. The average body size of baleen whales increased significantly after its disappearance, although possibly due to other, climate-related, causes. Another nearly complete associated megalodon dentition was excavated from the Yorktown Formations in the United States, and served as the basis of a jaw reconstruction of megalodon at the National Museum of Natural History (USNM). The interactions between various biotic factors are necessary for the reproduction of each species and to fulfil essential requirements like food, etc. Tooth color and discovery location are typically the easiest and most reliable methods to determine age. Like Brygmophyseter, it had a relatively small crown, making up only 18% of the tooth. [17] The small teeth at the symphysis, where the two halves of the jaw meet, are usually counted separately from the main teeth on either side. The blue whale can produce the loudest sound of any animal. Your Mobile number and Email id will not be published. Sunlight, water and land, all constitute the abiotic factors. WebFossilized shark teeth are the most popular fossil that we sell. [50], The first attempt to reconstruct the jaw of megalodon was made by Bashford Dean in 1909, displayed at the American Museum of Natural History. Grades PreK - 4 The same is true for other countries that border large bodies of water. Enabling them to process a wide range of senses. WebNew York [April 8, 2022] Hit HGTV series Home Town starring home renovation experts Ben and Erin Napier who balance a busy family life while they revitalize their small town of Laurel, Mississippi, has attracted more than 23 million viewers This effect cascades up the food chain, affecting every organism. A member of the cat family, leopards are born to hunt. [97] Infant megalodons were around 3.5 meters (11ft) at their smallest,[40]:61 and the pups were vulnerable to predation by other shark species, such as the great hammerhead shark (Sphyrna mokarran) and the snaggletooth shark (Hemipristis serra). Adopt a Great White Shark today and you'll be supporting vital Great White Shark research in the USA. [26], Megalodon inhabited a wide range of marine environments (i.e., shallow coastal waters, areas of coastal upwelling, swampy coastal lagoons, sandy littorals, and offshore deep water environments), and exhibited a transient lifestyle. Including scents produced by potential predators, prey or a mate. WebAccording to Renaissance accounts, gigantic triangular fossil teeth often found embedded in rocky formations were once believed to be the petrified tongues, or glossopetrae, of dragons and snakes.This interpretation was corrected in 1667 by Danish naturalist Nicolas Steno, who recognized them as shark teeth, and famously produced a depiction of a shark's [31]:46 Furthermore, after the closure of the Central American Seaway, tropical whales decreased in diversity and abundance. The curvature of the teeth increased medially, that is, the teeth in the front of the mouth were straighter than the teeth in the back of the mouth.The back teeth featured more wear than the front teeth. Lions are powerful and ferocious but did you know that female lions do most of the hunting? It comprises 150 vertebral centra, with the centra ranging from 55 millimeters (2.2in) to 155 millimeters (6in) in diameter. Majority of aquatic animals are streamlined which helps them to reduce friction and thus save energy. Examples of Herbivorous Animals. Dolphins are intelligent animals that display a wide range of unique behaviors. The smallest teeth are only 1.2 cm (0.5 in) in height, while the They are typically found at the bottom of the ocean floor. Geological events changed currents and precipitation; among these were the closure of the Central American Seaway and changes in the Tethys Ocean, contributing to the cooling of the oceans. These receptors sit in jelly-filled sensory organs called the ampullae of Lorenzini. [19] A single tooth row includes one or more functional teeth at the front of the jaw, and multiple replacement teeth behind this. WebMammal classification has been through several revisions since Carl Linnaeus initially defined the class, and at present, no classification system is universally accepted. "Structure and function of the horn shark (Heterodontus francisci) cranium through ontogeny: Development of a hard prey specialist", "First Shark from the Late Devonian (Frasnian) Gogo Formation, Western Australia Sheds New Light on the Development of Tessellated Calcified Cartilage", "FLMNH Ichthyology Department: Fossil Sharks", "Sink your teeth into this: 20 facts about shark teeth", "Sharks' teeth are falling! ", "The Path to Steno's Synthesis on the Animal Origin of Glossopetrae", 10.1671/0272-4634(2006)26[806:TTAOTG]2.0.CO;2, 10.1671/0272-4634(2001)021[0730:AASOCA]2.0.CO;2, "The Early Pliocene extinction of the mega-toothed shark, "Late Cretaceous (Cenomanian-Campanian) mid-palaeolatitude sharks of, "Ancient Nursery Area for the Extinct Giant Shark Megalodon from the Miocene of Panama", "CenomanianCampanian (Late Cretaceous) mid-palaeolatitude sharks of, "Palaeontological detective work unravels evolution of megatooth sharks", "Could Megalodon Have Looked Like a BIG Sandtiger Shark? [36] Nursery sites were identified in the Gatn Formation of Panama, the Calvert Formation of Maryland, Banco de Concepcin in the Canary Islands,[96] and the Bone Valley Formation of Florida. WebPassword requirements: 6 to 30 characters long; ASCII characters only (characters found on a standard US keyboard); must contain at least 4 different symbols; As a member you'll receive our Shark Focus Magazine twice a year. Learn more about Mailchimp's privacy practices here. The researchers noted that the 2002 Shimada crown height equations produce wildly varying results for different teeth belonging to the same shark (range of error of 9 metres (30ft)), casting doubt on some of the conclusions of previous studies using that method. Unlike bone, cartilage does not preserve (fossilize) well and therefore we rarely find shark fossils in any capacity, whether full or partial. WebInstead, fossilized shark teeth (along with limited shark skin scales (called denticles), vertebrae, and a few impressions of ancient shark tissue) give us clues to what happened to sharks over time. is an American animated educational interactive children's television program that premiered on Nickelodeon on September 6, 2005 in the United States. [40], Some fossil vertebrae have been found. Its chondrocranium, the cartilaginous skull, would have had a blockier and more robust appearance than that of the great white. One of the most notable phosphate mines is in Central Florida, Polk County, and is known as Bone Valley. A method to edit the backbones of molecules allows chemists to modify ring-shaped chemical structures with greater ease. Learning about animals is great fun. [121] Later, in August 2013, the Discovery Channel opened its annual Shark Week series with another film for television, Megalodon: The Monster Shark Lives,[122] a controversial docufiction about the creature that presented alleged evidence in order to suggest that megalodon was still alive. [28] Competition with white sharks is assumed to be a factor in other studies as well,[112][26][106] but this hypothesis warrants further testing. [13] The sediment that the teeth were found in is used to help determine the age of the shark tooth due to the fossilization process. In addition, Wroe and colleagues pointed out that sharks shake sideways while feeding, amplifying the force generated, which would probably have caused the total force experienced by prey to be higher than the estimate. [19][31]:30 Before this, in 1960, the genus Procarcharodon was erected by French ichthyologist Edgard Casier, which included those four sharks and was considered separate from the great white shark. It has anatomical adaptations for filter-feeding, dagger-like teeth; basking shark teeth are much smaller 56 mm (0.200.24 in) and hooked; only the first three or four rows of the upper jaw and six or seven rows of the lower jaw function. Fossil remains of some small cetaceans, for example cetotheres, suggest that they were rammed with great force from below before being killed and eaten, based on compression fractures. [16] Only after about 10,000 years will a shark tooth fossilize. Each tooth has a complex fluorapatite structure enameloid. Fossil shark teeth are almost always a tan, brown, or black color due to mineral replacement. Numerous fossilized flipper bones and tail vertebrae of large whales from the Pliocene have been found with megalodon bite marks, which suggests that megalodon would immobilize a large whale before killing and feeding on it. Find out how they hunt, what their pups are like and other interesting wolf facts. [40], In 2008, a team of scientists led by S. Wroe conducted an experiment to determine the bite force of the great white shark, using a 2.5-meter (8.2ft) long specimen, and then isometrically scaled the results for its maximum size and the conservative minimum and maximum body mass of megalodon. For instance, turbidity is an abiotic factor that majorly affects the aquatic ecosystem. [67] To support its large dentition, the jaws of megalodon would have been more massive, stouter, and more strongly developed than those of the great white, which possesses a comparatively gracile dentition. [14], Shark teeth cannot be collected from just any type of rock. Thank you for giving me very important information. [78], The feeding ecology of megalodon appears to have varied with age and between sites, like the modern great white shark. [30]:77 However, an analysis of the distribution of megalodon over time suggests that temperature change did not play a direct role in its extinction. Their teeth also contain many pressure sensitive nerves. The teeth of a Great White have broadly triangular blades with coarsely serrated edges. There are more than 400 shark species in the ocean, but they all have the same basic anatomy. More specifically, it includes all flora and fauna. Sharks are also known to lose at least one tooth per week. On the other hand, a white shark has triangular teeth that bear fine serrations. Identification of most sharks are found through a combination of tooth counts and tooth shapes. Dogs are popular animals which make for great family pets as well as reliable workers. They're able to track sounds and are particularly attracted to sounds made by wounded prey. From Makos to Megalodons, a fossil shark teeth is sure to impress. Requested URL: byjus.com/biology/carnivores-herbivores/, User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36. These adaptations often take place in crown shape and level of serration. Find and record empty shark eggcases that have washed up on the beach. WebAccording to Renaissance accounts, gigantic triangular fossil teeth often found embedded in rocky formations were once believed to be the petrified tongues, or glossopetrae, of dragons and snakes.This interpretation was corrected in 1667 by Danish naturalist Nicolas Steno, who recognized them as shark teeth, and famously produced a depiction of a shark's The claims that megalodon could remain elusive in the depths, similar to the megamouth shark which was discovered in 1976, are unlikely as the shark lived in warm coastal waters and probably could not survive in the cold and nutrient-poor deep sea environment. This is the same process that happens when metal rusts or during the formation of some minerals, like hematite and magnetite. Most of the teeth found here range from 3 to 10 million years old. Biotic resources include every lifeform in an ecosystem. Light doesnt travel well through water. Keeping you up to date with all the latest news about sharks and their conservation! The location where the tooth was found is a very important clue as to whether or not your tooth is a fossil. WebNigersaurus is a genus of rebbachisaurid sauropod dinosaur that lived during the middle Cretaceous period, about 115 to 105 million years ago. WebFossilized shark teeth are the most popular fossil that we sell. Its name derives from the dark stripes down its WebNigersaurus is a genus of rebbachisaurid sauropod dinosaur that lived during the middle Cretaceous period, about 115 to 105 million years ago. The pufferfish is a survivalist that thrives in nearly every tropical aquatic environment. [11], The teeth of plankton-feeders, such as the basking shark and whale shark, are greatly reduced and non-functional. Whether its endangered African animals, sea animals, wild animals or pets, there are so many amazing types of animals that each have their own characteristics and behaviors. [17] The teeth commonly found are not white because they are covered with sediment from fossilization. Biotic and abiotic are the two essential factors responsible for shaping the ecosystem. A fair amount of teeth are found washed up on beaches, deposited on river banks, or on cliff sides near the waters edge. [3] Through this system, sharks replace their teeth relatively quickly with replacement teeth that are ready to rotate because their teeth often get damaged while catching prey. The proposed relationship is: total length in meters = (0.096) [UA maximum height (mm)]-(0.22). The teeth of a Great White have broadly triangular blades with coarsely serrated edges. [9] These sharks include nurse sharks and angel sharks. Examples include dense flattened teeth for crushing; long needle-like teeth for gripping; pointed lower teeth for gripping combined with serrated, triangular upper teeth cutting, and teeth that are tiny, greatly reduced, and non-functional.[8]. This aggressive but slow-moving fish dominates feeding frenzies, and is a danger to survivors of oceanic shipwrecks and downed aircraft it has attacked more The stalling of the Gulf Stream prevented nutrient-rich water from reaching major marine ecosystems, which may have negatively affected its food sources. [11][12] In comparison, large great white sharks are generally around 6 meters (20ft) in length, with a few contentious reports suggesting larger sizes. Size. The term abiotic refers to the non-living entities in the ecosystem. A 6-meter (20ft) long female great white, which the authors considered the largest 'reasonably trustworthy' total length, produced an estimate of 16.8 meters (55ft). Miocene coprolite remains were discovered in Beaufort County, South Carolina, with one measuring 14cm (5.5in). So basically biotic is everything in the ecosystem? [95] However, Cooper and his colleagues in 2022 estimated the length of this 46 year old individual at nearly 16m (52ft) based on the 3D reconstruction which resulted in the complete vertebral column to be 11.1m (36ft) long; the researchers claimed that this size estimate difference occurred due to the fact that Shimada and his colleagues extrapolated its size only based on the vertebral centra. WebMammal classification has been through several revisions since Carl Linnaeus initially defined the class, and at present, no classification system is universally accepted. Abiotic factors that affect marine habitat. ), with a common ancestor around 4Mya. WebThe tiger shark (Galeocerdo cuvier) is a species of requiem shark and the last extant member of the Family galeocerdonidae.It is a large macropredator, capable of attaining a length over 5 m (16 ft 5 in). Follow the link to read a range of amazing whale facts. A 17-meter (56-foot) C. megalodon would have weighed about 59 metric tons (65 tons), and a 20.3-meter (67 foot) monster would have topped off at 103 metric tons (114 tons). According to Renaissance accounts, gigantic triangular fossil teeth often found embedded in rocky formations were once believed to be the petrified tongues, or glossopetrae, of dragons and snakes. The smallest teeth are only 1.2 cm (0.5 in) in height, while the Majority of aquatic animals are streamlined which helps them to reduce friction and thus save energy. 'big, mighty' and (odos), "tooth". Another good indicator is to identify the species. It is now considered a junior synonym of Carcharocles. WebWatch full episodes, specials and documentaries with National Geographic TV channel online. WebBook List. Because of this, a good amount of the teeth from Aurora, North Carolina have a deep brown root and a creamy tan blade. WebAdaptations of the Great White Shark. Beachcombing in Florida, California, Maryland or the Carolinas in the United States are generally low effort, decent yield options for the casual collector or enthusiast. Many species of shark have brains as complex as those of mammals. Enjoy these great dog facts which help explain why dogs are so special. [14][64], In 2021, Antonio Ballell and Humberto Ferrn used Finite Element Analysis modeling to examine the stress distribution of three types of megalodon teeth and closely related mega-toothed species when exposed to anterior and lateral forces, the latter of which would be generated when a shark shakes its head to tear through flesh. Biotic factors refer to all living organisms from animals and humans, to plants, fungi, and bacteria. These adaptations often take place in crown shape and level of serration. It is a stocky shark, most notable for its long, white-tipped, rounded fins.. A reflective layer of shiny cells that lies behind the retina. In the state of Georgia, shark teeth are found so often that they decided to make shark teeth the official state fossil in 1976. WebCarcharodon albimors Whitley, 1939 The great white shark (Carcharodon carcharias), also known as the white shark, white pointer, or simply great white, is a species of large mackerel shark However, most are smaller; males measure 3.4 to 4.0 m (11 to 13 ft), and females measure 4.6 to 4.9 m (15 to 16 ft) on average. As one species evolves into another, its teeth may become difficult to classify, exhibiting characteristics of both species. Living in all parts of the world, these animals include cats, dogs, insects, birds, sharks, gorillas, frogs, cheetahs, giraffes, elephants, horses, sharks and many more. For example, a tiger sharks teeth are rectangular with a hook-like recurve and large serrations. Simpson (1945) provides systematics of mammal origins and relationships that had been taught Biotic and abiotic are the two essential factors responsible for shaping the ecosystem. [76] Meanwhile, juveniles likely had a diet that consisted more of fish. [6][34] In this model, O. obliquus evolved into O. aksuaticus, which evolved into C. auriculatus, and then into C. angustidens, and then into C. chubutensis, and then finally into C. megalodon. [33] The remains of shark tooth-edged weapons, as well as chert replicas of shark teeth, have been found in the Cahokia mounds of the upper Mississippi River valley, more than 1,000km (620mi) from the ocean. Examples of biotic resources include all the living components present in an ecosystem. [30]:7475, Megalodon were contemporaneous with whale-eating toothed whales (particularly macroraptorial sperm whales and squalodontidae), which were also probably among the era's apex predators, and provided competition. Theyre super-sensitive to smells that are important to their survival. [98][99], The Earth experienced a number of changes during the time period megalodon existed which affected marine life. [49], In 2020, Shimada and colleagues suggested large size was instead due to intrauterine cannibalism, where the larger fetus eats the smaller fetus, resulting in progressively larger and larger fetuses, requiring the mother to attain even greater size as well as caloric requirements which would have promoted endothermy. Like Brygmophyseter, it had a relatively small crown, making up only 18% of the tooth. Discovery Has Jumped the Shark Week", "Shark Week Is Lying Again About Monster Megalodon Sharks", "TV Ratings: Shark Week Hits Record Highs With Fake 'Megalodon' Doc", "Fossil, Fossilized Teeth of the Megalodon Shark | NCpedia", "Why Megalodon (Definitely) Went Extinct", https://en.wikipedia.org/w/index.php?title=Megalodon&oldid=1124702696, Articles containing Ancient Greek (to 1453)-language text, Short description is different from Wikidata, Wikipedia indefinitely move-protected pages, Wikipedia pages semi-protected against vandalism, Taxonbars with automatically added original combinations, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 30 November 2022, at 02:27. [15], Its large size may have been due to climatic factors and the abundance of large prey items, and it may have also been influenced by the evolution of regional endothermy (mesothermy) which would have increased its metabolic rate and swimming speed. WebThe tiger shark (Galeocerdo cuvier) is a species of requiem shark and the last extant member of the Family galeocerdonidae.It is a large macropredator, capable of attaining a length over 5 m (16 ft 5 in). [30]:75 Various excavations have revealed megalodon teeth lying close to the chewed remains of whales,[30]:75[32] and sometimes in direct association with them. [51][76][77] In addition to this, they also targeted seals, sirenians, and sea turtles. At 188 decibels, the noise can be detected over 800 kilometres away. They were once living and so considered biotic. Find stories, updates and expert opinion. Biotic factors refer to all living organisms from animals and humans, to plants, fungi, and bacteria. Using the total height tooth regression equation proposed by Gottfried and colleagues produced an estimate of 15.3 meters (50ft). Whether its endangered African animals, sea animals, wild animals or pets, there are so many amazing types of animals that each have their own characteristics and behaviors. This process can be arduous and time consuming, but generally you can get close enough to tell you if you have a fossil or not. [3] They will replace teeth that are broken and young sharks can even replace their teeth weekly. Click here to find everything you need to get started. Fins and gills are the locomotors and respiratory organs respectively. The effectiveness of the tissue varies, with some sharks having stronger nocturnal adaptations. 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