Question

a human may go from being microscopic to being six feet tall in less than 16 years. what change on the cellular level accounts for most of the change in size?

a. the shape of the cells changes

b. the number of different kinds of cells increases

c. the size of the cells increases

d. the number of cells increases

Explanation:

Cell division (mitosis) leads to an increase in the number of cells. While cell growth (increase in cell size) and cell differentiation (change in cell shape and type) occur, the major contributor to the significant increase in body size from a microscopic state (zygote) to a six - foot - tall human in less than 16 years is the increase in the number of cells. Cell size has limits (due to surface - area - to - volume ratio), so a large increase in overall body size mainly comes from more cells.

Answer:

D. the number of cells increases