用中文回答下面三个问题的答案， Verbal reasoning:
a. Bees gather honey to make honey, so what is the main source of honey?
b. Bookstores mainly sell books. If I want to buy a novel, where should I go?
c. All plants require sunlight, water, and nutrients to grow. Cactus is a plant, so what does a cactus need to grow? Write exactly 4 paragraphs each separated with two new lines answering this question. The first paragraph must start with "makes".
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