Question

Simple diffusion is not able to meet the requirement of all the cells in multi-
cellular organisms because​

Answer 1

Answer:

As in multicellular organisms, all the cells are not in direct contact with environment, simple diffusion does not meet the requirement of all the body cells to get sufficient oxygen.

Explanation:

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Answer 2

Answer: As the size of an organism increases, its surface area to volume ratio decreases. Large multicellular organisms therefore cannot rely on diffusion alone to supply their cells with substances such as food and oxygen and to remove waste products. Large multicellular organisms require specialised transport systems.