Why is a nucleus found in both plant and animal cells?

Because it controls all life activities of the cell

Explanation:

The nucleus has a spherical body which is covered by a double membrane which contains hereditary materials, chromosomes and genes. The functions of the nucleus are as follows:

- it controls all the life activities of the cell

- It stores all the hereditary information as it contains DNA inside chromosomes which take part in cell division.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.