Question

the movement of oxygen molecules over time from one side of the semipermeable membrane to the other side is known as

oa osmosis.
ob diffusion.
oc plasmolysis.
od active transport.

Explanation:

Osmosis is the movement of water molecules across a semi - permeable membrane. Plasmolysis is the shrinkage of a cell due to water loss. Active transport requires energy to move substances against a concentration gradient. Diffusion is the passive movement of molecules (like oxygen) from an area of higher concentration to an area of lower concentration across a semi - permeable membrane.

Answer:

B. diffusion