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2. Chondrichthyes - Wikipedia

   en.wikipedia.org/wiki/Chondrichthyes

   Chondrichthyes ( / kɒnˈdrɪkθi.iːz /; from Ancient Greek χόνδρος (khóndros) 'cartilage', and ἰχθύς (ikhthús) 'fish') is a class of jawed fish that contains the cartilaginous fish or chondrichthyans, which all have skeletons primarily composed of cartilage. They can be contrasted with the Osteichthyes or bony fish, which have ...

3. Shark tooth - Wikipedia

   en.wikipedia.org/wiki/Shark_tooth

   Sharks continually shed their teeth; some Carcharhiniformes shed approximately 35,000 teeth in a lifetime, replacing those that fall out. [1] There are four basic types of shark teeth: dense flattened, needle-like, pointed lower with triangular upper, and non-functional. The type of tooth that a shark has depends on its diet and feeding habits.

4. Shark - Wikipedia

   en.wikipedia.org/wiki/Shark

   Shark teeth are embedded in the gums rather than directly affixed to the jaw, and are constantly replaced throughout life. Multiple rows of replacement teeth grow in a groove on the inside of the jaw and steadily move forward in comparison to a conveyor belt; some sharks lose 30,000 or more teeth in their lifetime. The rate of tooth replacement ...

5. Sawshark - Wikipedia

   en.wikipedia.org/wiki/Sawshark

   A sawshark or saw shark is a member of a shark order ( Pristiophoriformes / prɪstiˈɒfɒrɪfɔːrmiːz /) bearing a unique long, saw-like rostrum (snout or bill) edged with sharp teeth, which they use to slash and disable their prey. There are eight species within the Pristiophoriformes, including the longnose or common sawshark ...

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. Shark anatomy - Wikipedia

   en.wikipedia.org/wiki/Shark_anatomy

   The shark kidney excretes urea that is needed for the shark to have in its system so the shark does not become dehydrated from living in seawater. Sharks hearts have two chambers and the way the heart pumps. The shark heart's main importance is providing oxygenated blood to the entire body while filtering out the deoxygenated blood.