Which of the following is a defining characteristic shared by nearly all mammals?
AThey all lay eggs
BThey all live exclusively in water
CThey lack a backbone
DThey have hair or fur and typically nourish their young with milk
Explanation
Nearly all mammals share the defining characteristics of having hair or fur at some stage of life and nourishing their young with milk produced by mammary glands, along with being warm-blooded and typically giving birth to live young rather than laying eggs. These shared traits distinguish mammals from other major animal groups like reptiles, birds, and fish. Mammals as a group show remarkable diversity in size and habitat, ranging from tiny shrews to massive whales. Explore more Everyday Science MCQs on mcqstutor to keep practicing.
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