Q.

 A completely four-chambered heart is present in

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a

some reptiles, all birds and all mammals

b

no reptiles, all birds and all mammals

c

some reptiles, some birds and all mammals

d

all reptiles, all birds and all mammals

answer is B.

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Detailed Solution

Pisces : 2-Chambered heart

Amphibia : 3-chambered heart 

Reptilia : 3-chambered heart with incompletely divided ventricle (Crocodiles and alligators ahve 4-chambered heart)

Birds and Reptiles : 4-chambered heart

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