Which of the following characteristic feature | vedclass

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(C) is the correct answer.$1$. Phylum Chordata includes both jawless vertebrates (Agnatha) and jawed vertebrates (Gnathostomata). Therefore,not all ch

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Cartilaginous endoskeleton $\implies$ Chondrichthyes

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(C) is the correct answer.$1$. Phylum Chordata includes both jawless vertebrates (Agnatha) and jawed vertebrates (Gnathostomata). Therefore,not all chordates possess jaws.$2$. Most reptiles have a $3$-chambered heart with one incompletely divided ventricle,but crocodiles have a $4$-chambered heart.$3$. Class Chondrichthyes consists of cartilaginous fishes,which always possess a cartilaginous endoskeleton.$4$. While most mammals are viviparous,some like the duck-billed platypus and spiny anteater are oviparous.

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

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