Answer: Proteins and lipids
Explanation:
The fluid mosaic model of the cell membrane is made of protein and lipids. It is the structure of the cell membrane. There is a lipid bilayer in which the molecules of are embedded.
It provides the elasticity and fluidity to the membrane. The cell membrane of all the organism except few are made of lipid and protein.
This provides the mobility to the substances going out of the cell and coming in the cells. The cell wall is semipermeable and allows only selective molecules to pass through the cell membrane.