Question

What is meant by the term cell division , and why is it necessary ?

Answer 1

Cells also divide so living things can grow. When organisms grow, it isn't becausecells are getting larger. Organisms grow because cells are dividing to produce more and more cells. In human bodies, nearly two trillion cells divide every day.
In multicellular organisms like humans, mitosis is used for growth, development, and repair. As we discussed in the introduction, we start from a single cell. That cell must go through mitosis to create new cells, which will also then undergo mitosis. This process continues until we have the several trillion cells that make up our entire body. The cells we start with are like a blank page; they can become anything. Through multiple divisions and cues from their environment they change, or differentiate, into all the different types of cells we need in our body like heart cells or brain cells.

Thus without dividing cells life is impossible