You are presented with the question "Cells are the basic units allowing what in all living things" and the following answer choices: 
- movement
 - motion
 - produce light
 - all matter
 - rapid expansion
 - respiration
 - to stay warm
 - Animal survival

Now knowing that cells are the basic units of the structure and function of living things and respiration is a function of life, which means it is carried on by all living things, choose the best answer.


 

      respiration   