Which of the following is a poikilotherm with four-chambered heart?
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a
Ostrich
b
Crocodile
c
Platypus
d
Salamander
answer is B.
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Detailed Solution
Crocodiles are the only cold-blooded animals (reptiles) with a four-chambered heart. Ostrich and platypus are warm-blooded. The heart of salamander has only three-chambers (two atria and one ventricle).