Question

explain the exchange of gases acoress the cell membrane?

Answer 1

1. DIFFUSION is a net movement of molecules or atom from region of high concentration to low concentration as a result of random motions of atom or molecule
2. OSMOSIS is a process by which molecules of solvent tend to pass through a semipermeable membrane from a less concentrated solution into more concentrated one

Answer 2

Some substances such as carbon dioxide and oxygen and hydrogen, etc. can move across the cell by a process called diffusion.

The diffusing molecules May be solid, liquids or gases.

Here it don't requires cell membrane.