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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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Apopulation of black bears depends on salmon from a stream for food. if a drought causes the stream to run dry one year, how will this likely impact the black bear population?
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Nucleic acids offer variability because they contain alternate forms of genes called .
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What would happen to the variation between organisms in a population if their dna polymerase did not...
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