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"On the other hand," is a typical transition that shows a relationship between two ideas. It shows contrast.
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I think your answer is b.
He fears her because he believes that she has been sent by the thought police to spy on him.
They aerate the soil, pollinate blossoms, and control insect and plant pests. Many insects, especially beetles, are scavengers, feeding on dead animals and fallen trees, thereby recycling nutrients back into the soil. As decomposers, insects help create top soil, the nutrient-rich layer of soil that helps plants grow.
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