Mammals have ears as well as hair on their body,but whales and dolphins don't have why?
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i tgink because they have sonar system which is more effective and useful in water than hair
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Whales, Dolphins & Porpoises are MAMMALS: they breathe air into lungs, have hair (although they have a lot less than land mammals, and have almost none as adults), are warm-blooded (they maintain a high body temperature), have mammary glands with which they nourish their young, and they have a four-chambered heart. As a group of creatures they are known as Cetaceans& belong to the Order Cetacea. There are 87 species currently known to science within the Order Cetacea. The Order Cetacea is divided into 2 Suborders:
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