Why is diffusion sufficient for the movement of food and oxygen in unicellular organisms?

Asked by  | 18th Jun, 2008, 07:55: PM

Expert Answer:

In single-celled organisms the entire surface of the organism is in contact with the environment for the diffusion of substances. Hence only diffusion is needed for movement of food and oxygen in unicellular organisms.

But this is not the case in multi-cellular organisms, where the body size is large and all the cells may not be in direct contact with the surrounding environment.

Answered by  | 19th Jun, 2008, 12:04: PM

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