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What do single-celled organisms have?

Thin surface and large SA:V ratio

What do single-celled organisms do?

Absorb and release gases by diffusion through outer surface.

What does the large SA:V ratio provide?

Short diffusion pathway to all parts of the cell.

What does this satisfy?

Gas exchange requirements for small organisms

Why is it easier for unicellular organisms to exchange gases across membranes?

The whole cell surface is in contact with the environment