What is it called when molecules move across the cell membrane from an area of high concentration to an area of low concentration through a carrier protein?

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above

i believe it would be c: tons.