A. our share of resources B. a biological creature C. a given area D. the maintenance of the ecosystem E. the source of food F.

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问题 A. our share of resources B. a biological creature
C. a given area D. the maintenance of the ecosystem
E. the source of food F. various species
Plants are essential in an ecosystem because to other living creatures they are______.

选项

答案E

解析 根据第三段第一句话“Plants make up the biggest group of biological creatures within anecosystem,and that’s because they are the natural food producers for everyone.”可知,植物是有生命的生物的食物来源,所有它们对生态系统很重要,所以本题选E。
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