Take a compound microscope for example, the advantage of this common tool is to magnify a smaller object to make it view clearly. However the disadvantage is if you roll up the course adjustment knob too much the lenses will crack and you will have to give up some money.
Answer:
Transport proteins act as doors to the cell, helping certain molecules pass back and forth across the plasma membrane, which surrounds every living cell. In passive transport molecules move from an area of high concentration to an area of low concentration.
Explanation:
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They are movement, homeostasis, and energy.