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

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Possess a mouth with an upper and a lower jaw - Chordata

3-chambered heart with one incompletely divided ventricle -Reptilia

Cartilaginous endoskeleton -Chondrichthyes

Viviparous - Mammalia

answer is C.

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Detailed Solution

Cartilaginous endoskeleton - Chondrichthyes

Possess a mouth with an upper and a lower jaw – Chordata (Cyclostomes lack jaws)

3-chambered heart with one incompletely divided ventricle – Reptilia (Crocodile had 4 chambered heart)

Viviparous – Mammalia (Platypus is oviparous)

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