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.
only one cell.
B.
five cells each.
C.
as many cells as a human.
D.
hundreds of cells.

Answer 1

A. only one cell.

Bacteria are unicellular organisms — each bacterium is a single cell that carries out all life functions.