Question

.. Why will simple diffusion not meet the requirement of human beings?
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Answer 1

Answer:

if so , if it is done by diffusion ... it will take 60 years to reach blood from top to bottom of the body

Explanation:

but our heart pumps it nearly in a minute

Answer 2

Explanation:

simple diffusion will not meet the requirements of human beings because all the cells are not in direct contact with the external environment