Which one of the following sets of animals share a four-chambered heart?
(a) Amphibian, Reptiles, Birds
(b) Crocodiles, Birds, Mammals
(c) Crocodiles, Lizards, Turtles
(d) Lizards, Mammals, Birds
(b) Crocodiles, Birds, Mammals
Explanation: Amphibians have two-chambered heart, while most of the reptiles have three-chambered heart. Crocodiles, birds and mammals have four-chambered heart.
