In single celled organisms diffusion is sufficient to meet all their
requirements of food, exchange of gases or removal of wastes but it is not in
case of multicellular organisms. Explain the reason for this difference.
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Answer:A simple, unicellular organism (consisting of one cell) can rely on diffusion to move substances into and out of the cell. Its surface area is large compared to its volume , so nutrients and other substances can pass quickly through the membrane and around its 'body'.
Explanation:
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