Looking for someone in 10th grade biology? How can I help you.
The answer is Model. Hope this helps!!
I believe the answer is D.
C. A wall of stones and mortar
This would act as a model describing the cell membrane.
Explanation;
A cell membrane is made up of a phospholipid bilayer with embedded proteins.
A cell membrane hold the different components of the cell together and to protect it from the environment outside the cell. It acts as a boundary between the inside environment and the outside environment of a cell.
It regulates the materials that enters and exits the cell; through selective movement of substances in and out of the cell.
Answer:
A.Testable hypotheses
it makes the most sense out of the rest