Which of the following distinguishes a mammal from a reptile?
a. Mammals may have hair whereas reptiles have feathers.
b. Mammals suckle their young whereas reptiles do not.
c. Mammals emerge from eggs whereas reptiles give live birth.
d. Mammals evolved before reptiles.
e. Mammals evolved from amphibians whereas reptiles evolved from dinosaurs.
Answer: b. Mammals suckle their young whereas reptiles do not.
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