Ⅳ.阅读理解nt food chain，depending on which animals and plants live there.the consumers of the food chain.They eat other plants and animals.

　　Some animals only eat plants.Among this group of herbivores(草食动物)are rabbits，mice and cows.Carnivores are animals that eat other animals，like wolves，foxes and lions.redator，the strongest animal that is not eaten by others.Hawks or polar bears are such predators that dominate their habitats.，for example，is eaten by many other animals.Food chains that are connected to each other are called food webs.，bacteria and other organisms.These socalled decomposers break down dead animals and plants into small parts and enrich soil so that other plants can grow better.The nutrients of dead animals and plants are converted back to the soil so that plants can use them again.

　　The balance of plants and animals within a food chain is determined by nature.For example，if there are too many zebras in a tropical habitat，many of them will die because they cannot get enough food to feed on.This also means that there is less food for predators，like lions，to eat.And when there are fewer lions the zebra population will grow again.

　　解题导语　本文是一篇科普知识类说明文。文章用分类和举例的方式说明了食物链以及食物链中各种生物之间的关系。The food chain of a certain ecosystem depends on

　　．living there

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