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.

Hope this helps!

i think its both a and b

to figure the total magnification of an image that you are viewing through the microscope is really quite simple. to get the total magnification take the power of the objective (4x, 10x, 40x) and multiply by the power of the eyepiece, (usually 10x)