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Which of the following characteristic fe...

Which of the following characteristic features always holds true for the corresponding group of animals
`{:("(a)","Cartilaginous endoskeleton",,"Chondrichthyes"),("(b)","Viviparous",,"Mammalia"),("(c)","Possess a mouth with an upper and a lower jaw",,"Chordata"),("(d)","3- chambered heart with one incompletely divided ventricle",,"Reptilia"):}`

A

`{:(,"Viviparous",,"Mammalia"):}`

B

`{:(,"Possess a mouth with an ",,"Chordata"),(,"upper and a lower jaw",,):}`

C

`{:("3-chambered heart with one incompletely divided ventricle ",,"Reptilia "):}`

D

`{:("Cartilaginous",,"- Chondrichthyes "),("endoskeleton",,):}`

Text Solution

Verified by Experts

The correct Answer is:
D
Reptiles have 3-chambered heart except crocodiles. Mammals are viviparous except prototherian mammals, chordates have jaws except protochordates and cyclostomes.
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