Answer:
To move substances against a concentration or electrochemical gradient, a cell must use energy. Active transport mechanisms do just this, expending energy (often in the form of ATP) to maintain the right concentrations of ions and molecules in living cells.
Explanation:
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As the cell increases , the ratio of surface area to weight of the cell decreases . this decreases the efficiency of the rate of diffusion and metabolism of the cells therefore the larger the cell the less efficient to maintain the effectiveness of the body a large cell will divide rather than continue to grow
To make amino acids, proteins, and DNA. When organisms die, their bodies decompose bringing nitrogen into the soil on land or into ocean water.
Answer:
D: the movement of particles from low to high concentration, using energy in the form of ATP.
This is because active transport uses ATP to move substances against the concentration gradient in an organism.
