PLZ HELP ME ITS 25 POINTS
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Biology, 21.06.2019 23:00
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 11:30
Which of the following explains why a tree is often used as a model to represent the principle of common descent
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