<span>The answer is : movement, reproduction, obtaining food and oxygen, and body structure</span>
Answer:
It is a group designed to not be affected by any variables and to be used as a comparison to the other groups. It helps increase the reliability of your results, as it shows your independent variable is what made something happen in your experiment.
I think the answer is evolution.
Skin is the Largest barrier agaisnt Pathogens which include Bacteria which cause infections.