Why Diffusion can work only in unicellular and simple multicellular organisms?
Difficulty: Medium
One-way molecules move is by diffusion but it alone cannot supply the need. It takes much time for materials in solution to diffuse even a few inches Diffusion can work only in unicellular and simple multicellular organisms because every corner of their body is in close and direct contact with the environment. In complex multicellular bodies, cells are far apart from the environment and such bodies need a comprehensive system for the transport of materials.
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