Which must occur in order for an organism to grow and produce new cells?

mitosis

Explanation:

Growth, the increases in cell size and number that take place during the life history of an organism.

Explanation:

Growth is seldom random. Rather, it occurs according to a plan that eventually determines the size and shape of the individual. Growth may be restricted to special regions of the organism, such as the layers of cells that divide and increase in size near the tip of the plant shoot.

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answer; i believe the answer is hydraulic action;