Multicellular organisms require a transport system because their low SA:Volume ratio means the diffusion distance is too great for efficient substance exchange.
Organismos multicelulares necessitam de um sistema de transporte porque a sua baixa relação SA:Volume significa que a distância de difusão é demasiado grande para a troca eficaz de substâncias.
| Front | Why do multi-cellular organisms need a transport system |
|---|---|
| Back | Low SA:Volume ratio, diffusion distance too large |
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