Question

Why are exchange surfaces NOT needed for single-celled organisms?

Accepted Answer

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.

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.

Surfaces Cell Volume Exchange Needed Single Celled Organisms Gases