Horse Anatomy Exam 1 Practice

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Mammals are defined by which characteristic?

Animals that lay eggs

Animals that nurse their young

Lactation and nursing define mammals. The ability to produce milk in mammary glands and feed it to offspring is a trait shared by all mammals, linking them from whales to mice to humans. This feeding strategy sets mammals apart from other groups: birds and many reptiles lay eggs, scales are typical of reptiles and some fish, and photosynthesis is a plant feature. So, animals that nurse their young best define the mammal group.

Animals with scales

Animals that photosynthesize

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