Question

1 Why is diffusion insufficient to meet the oxygen requirements of multi- cellular like humans?​

Answer 1

Answer:

Because human beings r multicellular n complex organism in which not every cells are in direct contact with environment. It takes 3 yrs to reach oxygen from lungs to toe.

Answer 2

Answer:

sapmays

Explanation:

she said it takes 3 yr to reach to some parts buy that is related to some particular organs like feet