Question

why there is no need of transportation system in unicellular organism but it is most important in multicellular organism​

Answer 1

Answer:

Most multicellular plants and animals have too small a surface area to volume ratio so diffusion would be too slow to provide the necessary molecules. Therefore, they require a system to transport nutrients and waste products around the organism.

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Answer 2

Answer:

there is no transportation system in unicellular organisms because their cells are in direct contact with atmosphere , so by the process of diffusion nutritions transport in them . Whereas , in multicellular organism cells are so far from each other and they have no contact from the atmosphere so hemoglobin ( respiratory pigment ) is responsible for transportation in human beings .