Smaller single-celled organisms do not require as high an oxygen concentration as larger ones do.This is because the smaller cells

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Smaller cells have a greater surface area-to-volume ratio, which allows for more efficient diffusion of gases such as oxygen. This is because a high surface area-to-volume ratio facilitates the exchange of gases between the cell and its surroundings. Therefore, smaller cells do not require as high an oxygen concentration as larger cells do, as diffusion can occur more easily due to their increased surface area-to-volume ratio.

Smaller Single-Celled Organisms Do Not Require as High an Oxygen