Which of the following characteristic feature | vedclass

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(C) Let us analyze each option:$A$: Chordata includes Agnatha (jawless vertebrates like lampreys),so this is not true for all chordates.$B$: Reptiles

Vedclass · Accepted Answer

Cartilaginous endoskeleton - Chondrichthyes

Vedclass · Answer

(C) Let us analyze each option:$A$: Chordata includes Agnatha (jawless vertebrates like lampreys),so this is not true for all chordates.$B$: Reptiles like crocodiles have a $4$-chambered heart,so this is not true for all reptiles.$C$: Chondrichthyes are characterized by a cartilaginous endoskeleton,which is a defining feature of this class.$D$: While most mammals are viviparous,monotremes (like the platypus) are oviparous,so this is not true for all mammals.Therefore,the correct option is $C$.

Which of the following characteristic features always holds true for the corresponding group of animals?

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