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Cartilage

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Caribbean, Bahamas, Caribbean Reef Shark
Jim Watt/Perspectives/Getty Images
Definition: Cartilage is a tough, flexible tissue, which is softer than bone. In humans, cartilage forms a temporary skeleton in the fetus and infant, and is later replaced by a bone skeleton. In cartilaginous fishes, such as sharks and rays, their entire internal skeleton is made of cartilage, rather than ossified bone.
Also Known As: Gristle
Glossary - Marine Life and Marine Biology Terms

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