Answer:
B
Explanation:
Cell membranes allow ALL substances to pass through easily
It is selectively permeable so only certain molecules can pass through it.
It acts more like a fluid than a solid because its molecules constantly moving.
Cell membranes surround all animal, plant, and bacterial cells.
It is a bilayer composed mainly of phospholipids and proteins
Answer:
D
Explanation:
It allows only certain molecules to pass through
