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An online academic article written in March 2015
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Because the deep water brought to the surface is often rich in nutrients, coastal upwelling supports the growth of seaweed and plankton. These, in turn, provide food for fish, marine mammals, and birds. Upwelling generates some of the world's most fertile ecosystems.
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you are discussing each subject separately, but in each case, you use the same basis of comparison to select your points, and you arrange these points in the same order.
The answer is B. This is like a spider web. Even though they do different things they all tie together to make a wonderful essay.
