Which of the following characteristic fe...

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

A

3-chambered heart with one incompletely divided ventricle ........Reptilia

B

Cartilaginous endoskeleton.......Chondrichthyes

C

Viviparous.......Mammalia

D

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

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The correct Answer is:

B

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