How do you observe internal and external features of the mammalian heart?
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Mammals are amazingly diverse animals. They live in nearly every available habitat on Earth—including deep seas, tropical rainforests, and deserts—and they range in size from one-ounce shrews to 200-ton whales. What exactly is it that makes a mammal a mammal, and not a reptile, a bird or a fish? There are eight main mammal characteristics, ranging from having hair to four-chambered hearts, that set mammals apart from all other
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Answer: External is applied to forces or influences outside the entity.
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