<span>Arms of primates and wings of birds are variations of FORELIMBS</span>
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A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra (shadow). This can occur only when the sun, Earth and moon are aligned (in "syzygy") exactly, or very closely so, with the Earth in the middle.
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Fossils are the preserved remains or traces of animals, plants, and other organisms from the past. Fossils are important evidence for evolution because they show that life on earth was once different from life found on earth today
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Curiosity after a step is completed, when your new hypothesis is more probable than your prior one
