Question

explain why does multicellular organisms need a transportation system for carrying food and oxygen

Answer 1

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The body of multicellular organism is very large and complex due to this large size they need transportation system for carrying blood and oxygen.

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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.