What is the main purpose of cell division in unicellular organisms?

To reproduce and create new, genetically identical organisms through a process called binary fission.

In multicellular organisms, what are two purposes of cell division?

Growth of the organism and replacement of worn out or injured cells.

The DNA must replicate or copy itself.

It condenses into an X-shaped structure with two genetically identical sister chromatids joined by a centromere.

I can describe and explain the basic needs of cells for growth and reproduction.

1
Cells use a process called cell division to make new cells called daughter cells.
2
Before a cell divides, its DNA must replicate or copy itself so that the information can be passed on to each daughter cell.
3
Human somatic cells have 23 pairs of chromosomes for a total of 46, while gametes have a total of 23 chromosomes.