Question

A membrane that allows onaly some materials to move in and out of the cells is ​

Answer 1

That's a Cell Membrane.

Answer 2

The cell membrane is selectively permeable, allowing only certain substances to pass through. Passive transport is a way that small molecules or ions move across the cell membrane without input of energy by the cell. The three main kinds of passive transport are diffusion, osmosis, and facilitated diffusion.