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Chemistry, 22.06.2019 15:30
Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium
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When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?
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How do living and nonliving things interact in the environment?...
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