A stiff layer on the outside of the cell to provide protection and helps the cell maintain its shape.  Not in animal cells. BTH-This is in science.

Cell Wall

Explanation:

Plant cells have cell walls, as animal cells do not. :)

Cell wall

Explanation:

This is found outside the cell membrane. Its main purpose is to provode protection and to maintain its shape.

HOPE THIS HELPED

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

it is called the mitotic spindle