Question

the movement of oxygen molecules over time from one side of the semipermeable membrane to the other side is known as
a osmosis.
b diffusion.
c plasmolysis.
d active transport.

Explanation:

Oxygen molecules moving from higher to lower concentration across a semipermeable membrane without energy input is diffusion. Osmosis involves water, plasmolysis is cell shrinking, active transport requires energy.

Answer:

B. diffusion.