Fact 1: Cells are the basic units of the structure and function of living things.

Fact 2: An organism is a living thing.

Given the two facts above, answer the question "Cells are the basic units of the structure and function of what?" with the following options: 
- animals
 - Most plants
 - humans
 - organisms
 - cell walls
 - rock
 - cell membranes
 - mammals


 

    organisms     