Question

the smallest unit of life is described as a
a virus
b nucleus
c organelle
d cell

Explanation:

The cell is considered the smallest unit of life. Viruses are not considered living organisms on their own in a strict sense as they require a host cell to carry out life - like processes. The nucleus is an organelle within a cell, and an organelle is a specialized structure within a cell. So the smallest unit of life is the cell.

Answer:

D. cell