What is this cycle called? (ignore the pencil marks, most likely incorrect)

This looks like the process which plants turn carbon dioxide into oxygen, refers to photosynthesis, and is called the "oxygen cycle"

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