Which of the following characteristic features always holds true for the corresponding group of animals?
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a
Possess a mouth with an upper and a lower jaw - Chordata
b
3-chambered heart with one incompletely divided ventricle -Reptilia
c
Cartilaginous endoskeleton -Chondrichthyes
d
Viviparous - Mammalia
answer is C.
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Detailed Solution
Cartilaginous endoskeleton - ChondrichthyesPossess 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)