A mammal is any animal that has hair,three middle ear bones,and mammary glands.Mammals give live birth as well.
multicellular organism whose mouth develops from a primary embryonic opening, such as an annelid, mollusk, or arthropod.
(why google is helpful)
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Igneous rocks and Metamorphic rocks determine the age of the earth.
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it has to do with the light or the brightness of a star
