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Biology, 21.06.2019 23:00, genesisheaven1
The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?
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Biology, 22.06.2019 00:00, bettybales1986
As a small change in a person's dna can cause a genetic disorder
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On average, fetuses gain about pounds during the last trimester of pregnancy, which brings the aver...
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