Give one reason why multicellular organisms r | vedclass

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(C) $1$. In multicellular organisms, the body size is large and complex.$2$. Most cells are located deep inside the body and are not in direct contact

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Because the body surface area is too small to provide oxygen to all cells by simple diffusion.

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(C) $1$. In multicellular organisms, the body size is large and complex.$2$. Most cells are located deep inside the body and are not in direct contact with the external environment.$3$. Simple diffusion is too slow to meet the oxygen requirements of all cells efficiently.$4$. Therefore, specialized organs are required to facilitate the exchange of gases.

Give one reason why multicellular organisms require special organs for the exchange of gases between their body and their environment.

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