Single-celled organisms do not require specialized exchange surfaces due to their high surface area to volume ratio, which facilitates efficient diffusion of gases and dissolved substances directly across the cell membrane.
Single-celled organisms don't need exchange surfaces because their high surface area to volume ratio allows gases and dissolved substances to diffuse directly across the cell membrane efficiently.
| Front | Why are exchange surfaces NOT needed for single-celled organisms? |
|---|---|
| Back | Gases and dissolves substances can diffuse directly into and out of the cell across the cell membrane. Because the large surface area to volume ratio, enough surfaces can be echanged across the membrane to supply the volume of the cell. |
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