Question

Organisms can be made up of one or many cells. Humans and other animals, which have complex body structures and systems, are made up of many cells.

Bacteria are made up of
A.
hundreds of cells.
B.
as many cells as a human.
C.
five cells each.
D.
only one cell.

Answer 1

D. only one cell.

Bacteria are unicellular (single-celled) organisms — each bacterium is one cell that carries out all life functions.