Question

why do the number of cells vary​

Answer 1

Cells have different shapes because they do different things. ... Animal cells come in many different shapes and sizes. The shapes of cells have evolved to help them carry out their specific function in the body, so looking at a cell's shape can give clues about what it does.

Answer 2

Here is the answer buddy:

Cell size is limited by a cell's surface area to volume ratio. A smaller cell is more effective and transporting materials, including waste products, than a larger cell. Cells come in many different shapes. A cell's function is determined, in part, by its shape.

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