After the first stages of development are complete, cells begin to divide in the same way that body cells divide throughout the rest of the organism's life. in this type of division, the cells

the cell divides by mitosis

Explanation:in this process the cell divides into two identical cells called the daughter cells.the daughter cells end up with the same amount of chromosomes in their nucleus like the parent cells .

Mitotic division involves four stages;prophase, metaphase,anaphase and telophase.

In prophase,the chromosomes shorten and thicken.homologous chromosomes join to become chromatids

In metaphase,the chromatids arrange themselves at the equator of threadlike spindle fibres

In anaphase,the chromatids separated and move to opposite ends of the cell

In telophase, the spindle break down,the chromosomes lengthen and the cytoplasm of the cell divides into two.

this leads to growth and replacement of cells

double in size and then divide to form two new cells.

Explanation:

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.