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Which have four chambered heart

A. Fish and Mammals
B. Amphibians and Birds
C. Amphibians and Reptiles
D. Birds and Mammals

Answer & Solution
Option: D
Explanation :Aves (Eg. Birds)- Four chambered (2 atria and 2 ventricles). Mammalia (Eg. Monkey, Tigers, Human) Four chambered (2 atria and 2 ventricles).
Pisces (eg. Fishes) Two chambered (1 atrium and 1 ventricle).
Amphibia (eg. Frogs)- Three chambered (1 ventricle and 2 atria).
Reptilia (eg. Snakes, Lizards, Crocodiles) – Usually all reptiles have three chambers But crocodile alone sometimes have four-chambered heart due to their adaptation for their environment.
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