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  3. Virtually all plant and animal species on Earth can be found in tropical rainfor

Virtually all plant and animal species on Earth can be found in tropical rainfor

游客2023-09-16  60
问题 Virtually all plant and animal species on Earth can be found in tropical rainforests. [br] 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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