Question

why are diffusion and osmosis not suitable for transportation in higher organisms like human beings?

Answer 1

Because diffusion or osmosis are slow processes and organisms like human beings are multi cellular in which each cell rewuires oxygen and by diffusion oxygen cannot reach to each cell in the required proportion.
1 molecule of oxygen will take approx 3 years to diffuse from the lungs to ur toe.


Hope u got that

Answer 2

HEYMATE!!!!

■ In multi - cellular organisms, all the cells may not be in direct contact with the surrounding environment.

■thus,simple diffusion will not meet the requirements of all the cells.

■In case of a single - celled organism, no specific organs for taking in food, exchange of gases or removal of wastes may be needed because the entire surface of the organism is in contact with the surrounding environment.

HOPE IT HELPS YOU !!!!