What can easily pass through the cell membrane? What cannot pass through the cell membrane?
In passive transport, molecules, move the concentration gradient.

i dont rlly get what ur asking but basically gasses diffues across the cell membrane from high conc to low concentration.

i dont know what passive transport is but active transport goes against the concentration gradient so im guessing passive is the opposite and goes with the conc gradient

Explanation:

the answer is b.

hope it