why organisms can respire only by diffusion process
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The primary function of the respiratory system is to deliver oxygen to the cells of the body's tissues and remove carbon dioxide. ... In unicellular (single-celled) organisms, diffusion across the cell membrane is sufficient for supplying oxygen to the cell. Diffusion is a slow, passive transport process.
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All living organisms respire. Cells need and use the energy that is formed through this process to assist with life processes in order for organisms to survive and reproduce. Oxygen and carbon dioxide are the main gases involved in aerobic respiration. ... They carry out gas exchange in a different way to mammals.
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