How do estuaries compare in terms of production compared to other areas?

there is no productivity in an estuary.
estuaries are the most productive of all marine ecosystems.
estuaries are productive, but far less than other marine ecosystems.
estuaries are the least productive of all marine ecosystems

it is prolly d and c and f

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