Question

why does organisms need a transport system​

Answer 1

Answer:

For efficient transportation of blood and providing nutrition.

Explanation:

In unicellular organisms or less complex multicellular organisms, there is no need for transport system as the bodies are small. As organisms get complex, blood floating around won't do the trick. so we need transportation system.

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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.