Question

With parallel flow, diffusion of urea happened at regions I and II but not at regions III, IV, or V because...

A
Urea was too big to fit through the pores in regions III, IV, or V.
B
There was no concentration gradient for urea in regions III, IV, or V.
С
There was no urea in the blood in regions III, IV, and V.
D
The pore size was too small in regions III, IV, and V.

Answer 1

The correct answer is

b

Step-by-step explanation:

First we can elimenate A and D because the pore size is the same.

C is wrong, there is still some urea in the blood, however is less

We are left with B which is the correct answer, i did the gizmo

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Answer 2

Answer:B

Explanation:bc all of the other ones was equal together and the concentration gradient could not spread them