SCIENCE
ZOOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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sharks and rays
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snails and clams
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crabs and crayfish
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None of the above
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Detailed explanation-1: -Chondrichthyes is a class of jawed fishes having a cartilaginous skeleton. The class includes a diverse group of fishes including sharks, rays, skates and chimaeras. They are mostly marine fishes. The other group of fishes are bony fishes, which are included in the class Osteichthyes.
Detailed explanation-2: -Sharks belong to the class Chondrichthyes (chondrichthyans), which differ from Osteichthyes or bony fish as their skeleton is cartilaginous.
Detailed explanation-3: -Rays, skates, and sharks all belong to the class Chondrichthyes (Greek, chondro meaning cartilage and ichthosmeaning fish). Characteristics of Chondrichthyes include a skeleton made of cartilage, jaws, paired fins, and paired nostrils.
Detailed explanation-4: -chondrichthyan, (class Chondrichthyes), also called chondrichthian, any member of the diverse group of cartilaginous fishes that includes the sharks, skates, rays, and chimaeras.