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  3. Virtually all plant and animal species on Earth can be found in tropical rainforests. Since rainforest bacteria and trees depen

Virtually all plant and animal species on Earth can be found in tropical rainforests. Since rainforest bacteria and trees depen

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问题 Virtually all plant and animal species on Earth can be found in tropical rainforests.
Since rainforest bacteria and trees depend on cacti other for life, the relationship they form is termed______.
选项
答案symbiotic
解析 由题干中的bacteria和relationship定位到第三个小标题下第3段第2、3句Rainforest bacteria and trees have a very close，symbiotic(共生的)relationship. The trees provide the bacteria with food…此处需要填入形容词性成分。原文第3句和题干中的rainforest bacteria and trees depend on each other for life表述的内容相同；而第3句是对第2句的进一步介绍。故答案为symbiotic。
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