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An atom of calcium contains 20 protons. how many electrons does it have?
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Alaboratory investigation included examine prepared slides of pond water singled celled organisms with a nucleus and either cilia or flagella were visible these organism probably belong to the kingdom
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Following photosynthesis, is moved to the roots for storage through the phloem.
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An atom of calcium contains 20 protons. how many electrons does it have?...
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