If you were testing how well different dish soaps cleaned your dishes, the
control group would be:
o
a. a group of dishes that was placed in a different washing machine.
b. a group of dishes with twice the normal amount of dirt on them.
o
c. a group of dishes that received the standard amount of dish soap.
o
d. a group of dishes that did not get washed.

D. a group of dishes that did not get washed.

Explanation:

There are two groups in an experiment: the experimental group, and the control group. The control group would be a group of dished that are not washed because you need to use them as reference to the dishes you are cleaning, and which ones are most clean compared to your control group dishes.

answer; both surfaces of the membrane are nonpermeable