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:

The question describes oxygen molecules moving from a higher concentration area to a lower concentration area across a semipermeable membrane over time. Osmosis is the movement of water, plasmolysis involves cell shrinkage due to water loss, and active transport requires energy (not passive movement shown here). Diffusion is the passive movement of particles from high to low concentration.

Answer:

B. diffusion.