Answer:
Lipids
Explanation:
The cell membranes are primarily made up of two layers. The central bilayer is formed by the lipids in the cell membrane. Lipids surround the cytoplasm of cells to help the cell control substances that go in and out of the cell. This helps to protect the cell from a harmful substance that may potentially enter the cell.
(Some information from "StaceeLichtenstein" on Brainly)
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