Why Is Diffusion Insufficient to meet the Oxygen Requirements of Multicellular Organisms Like Humans?

Multicellular organisms such as human beings have complex body designs and large body size. Because of that  oxygen cannot diffuse into all the cells of the human body quickly.
Therefore, diffusion is insufficient to meet the oxygen requirement of multicellular organisms like humans.

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How do the Guard cells Regulate Opening and Closing of Stomatal Pores - class 10
What is the Significance of Emulsification of Fats class 10

What is the Significance of Emulsification of Fats

Emulsification of fats is the process in which large fat globules are broken down into small uniformly distributed fat particles by the action of bile salts present in bile juice.
Digestion is greatly aided by The Process of Emulsification.

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