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IT depends on what cell. In the plant cell it is the cell wall and the cell membrane. But in the animal cell it is only the cell membrane.
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Osmosis and diffusion
A plant cell has a cell membrane which controls the movement of substances in and out of the cell. :D
The cell membrane conrols all the substances that go in and out of the plant cell
The cell membrane protects the cell and regulates what substances enter and leave the cell.
cell membranes control the exchange of substances between a cell and its environment.
In animal cells, the cell membrane; and in plant cells, the cell wall.
Animal cells do not have cell walls (plant cells do). The cell membrane of an animal cell controls the flow of substances in and out of the cell, and keeps the cell contents contained.
If substances did not pass through cell membranes, then all single-celled and multicellular organisms would die.
Osmosis is the movement of fluid and substances in and out of a cell through the cell well. Transference is also a way for things to move in and out of a cell.
In plant cells, a cell membrane and a cell wall surround the cell to aid in support and protection. In animal cells, only a cell membrane surrounds the cell and controls what substances go in and go out of the cell.