Muscle cells can get longer and shorter. how does this ability fit in with their job in the body?

There is a liquid capsule inside a cup full of liquid. the cup full of liquid has salt in it and the liquid capsule has no salt in it. in which direction will the solvent flow? a. the salt does not have to move b. from the capsule to the larger cup c. equally between the capsule and the cup d. from the larger cup to the capsule

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Which label identifies the part of the atp molecule that changes when energy is released in the cells of all living things