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What are the three primary mechanisms by which molecules move across the cell membrane. explain how each mechanism goes with or against the concentration gradient and whether they each use energy.
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Casts and mold are a type of preservation where the original material decays, leaving a mold in surrounding rock that can be filled with another sediment a. true b. false
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2points what do bacteria have in common with the cells of other living organisms?
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Which tool could you see a plant cell? a. a filter b. a microscope c. a microwave d. an electromagnet
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What are the three primary mechanisms by which molecules move across the cell membrane. explain how...
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