Question

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Answer 1

Explanation:

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Here's the answer you are looking for

In unicellular organisms there is only one cell which governs the all the activities of the cell so only through diffusion materials like gases, water etc can exchange between the environment and the cell.

It does not require any special system through which exchange takes place.

But in case of a multicellular organisms there is separate system for separate function. Many cells clustered together to form tissues, tissues to organs and organs to organ system. So through diffusion the process of exchange of materials between the organism and the environment is not fulfilled

Multicellular organisms have a complicated system so diffusion is not the process which can fulfil the requirements of the organisms.

For instance, in human beings diffusion of gas from the head to the feet can take up to 3 years.

Therefore, diffusion is not efficient in performing different functions that are required for a multicellular organism to live.

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Answer 2

Answer:

Unicellular organisms can absorb sufficient oxygen because of its complete contact with the atmosphere, but in multicellular organisms the rate of absorption and diffusion becomes very less because all cells are not in direct contact with the atmosphere. Multicellular organisms require greater amount of oxygen to sustain life processes which cannot be fulfilled by the process of diffusion.