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There are 25 elements found in living things. How many of these elements are found in some organisms but not all?
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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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Which type of respiration takes place when there is no oxygen present
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There are 25 elements found in living things. How many of these elements are found in some organisms...
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