Question

why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans

Answer 1

Since diffusion is a very slow process and it will require very large amount of time for oxygen to reach each and every part of the body. That is why diffusion is insufficient to meet the energy requirements of multicellular organisms like humans

Answer 2

Diffusion is unable to meet oxygen requirements of multi-cellular organisms like humans because diffusion is a slow process.

EXPLANATION:

This means that the time taken for oxygen to circulate to all body cells is more. In addition, humans need a lot of oxygen in their cells and tissues so that the body activities can take place in the right manner and in time.

With diffusion, oxygen can’t diffuse into all body cells in a quick manner because the human body is large and has a large number of cells and tissues.