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whaleshark.org, wildbook for whale sharks Sharkbook is a global database for identifying and tracking sharks , particularly whale sharks , using uploaded photos and videos.In addition to identifying and tracking sharks, the site allows people to "adopt a shark" and get updates on specific animals.
The really dark shark teeth, Dunn said, are millions of years old and more commonly found. The lighter teeth, beige or pearly in color, fell out more recently. Eventually, once they’ve broken ...
Shark teeth cannot be collected from just any type of rock. Any fossils, including fossil shark teeth, are preserved in sedimentary rocks after falling from their mouth. [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. [15]
Shark teeth are strong and made of enamel. Many sharks have 3 rows of teeth. These teeth are embedded in the gums, not the jaw. [10] Sharks are born with teeth that are constantly being replaced. Teeth are replaced every two weeks, approximately. [10] The shape of the teeth determine the diet of the shark.
[34] [35] [36] Shark teeth are embedded in the gums rather than directly affixed to the jaw as in some fish. [37] Shark teeth form within the jaw move outward in rows until they are eventually dislodged in a manner similar to a conveyor belt. [38] Their scales, called dermal denticles, and teeth are homologous organs. [39]
With a few recorded exceptions, juveniles are found in deep water and only adults are present above a depth of 200 m (660 ft); this may serve to reduce predation on young individuals by large, shallow-water predators such as the great white shark (Carcharodon carcharias). Males mature at a length of 2.0–2.5 m (6.6–8.2 ft) and females at a ...
Ptychodus was a large shark, previously estimated at 10 meters (33 feet) long based on extrapolation from teeth. [ 13 ] [ 14 ] The subadult specimen with the largest vertebra showed that it could reach lengths of 4.3–7.07 m (14.1–23.2 ft), so a 10 m (33 ft) length is possible, but more analysis is required for verification.
Typer Shark. Typer Shark is an online game classic from Popcap games. In Typer Shark you command a dive to to search for sunken treasure. Along the way you have to type your way through deadly ...