The control group is usually the group in which none of their variables are changed. This group is used in order to compare it with the outcomes of the other groups.
I think you are looking for the answer of: digestion.
Hope this helps! <3
The largest river in the world is the Amazon River, 4,345 miles in length located in South America.
Which of the following would you look for on the label of bottled water to signify safety?
-contains filtered water"
