Our office has r to Shanghai from Beijing. 题目和参考答案——青夏教育精英家教网—

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Our office has r to Shanghai from Beijing.

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Energy goes from one plant or animal to another.A food chain shows how this energy moves.Each time an animal gets eaten,its energy is passed onto the animal that eats it.The food chain is very important because it keeps the balance of nature.If one part of the food chain disappears,it can affect all the other plants and animals.Any threat to the food chain is a threat to the environment’s biodiversity(生物多样性).The food chain helps keep animal populations in balance.However,if something happens to damage one of the links in the food chain,that balance is broken.If one animal becomes endangered,it puts all the animals above it at risk.

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