Why is cell division important for both single-celled and multicellular organisms?

Because it is a mode for reproduction and growth.

Explanation:

Cell division is important for both single-celled as well as multi-cellular organisms.

In single-celled organisms, the cell division is the process which helps them to reproduce and form new organisms.

In multi-cellular organism, the cell division becomes more important because both, the division and growth in cells of multi-cellular organism occurs by means of cell division. When cells divide, the number of cells increases and it is seen as a overall growth in the organism. Damaged tissue repair is also accomplished by the cell division itself.

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is this for the e2020 class