Why is seaweed better adapted to conditions in the intertidal zone on a rocky shore than to a supratidal zone on a sandy beach?

Why is seaweed better adapted to conditions in the intertidal zone on a rocky shore than to a supratidal zone on a sandy beach?   Please explain. I don't know the answer. 

12/11/15

how does the dissolved oxygen content of the lake change during eutrophication

How does the dissolved oxygen content of the lake change during eutrophication  

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