1. All organisms are composed of…
A. one or more cells, because they are the basic unit of life.
B. air because all organisms breathe.
C. one or more organs because all organisms are complex.
D. blood because all organisms have circulator systems.
A. one or more cells, because they are the basic unit of life.
Explanation:
The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells.
