求教阅读TPO3中的一道阅读题

快乐小水鱼UID: 2762984

阅读TPO3 中“The long-term stability of ectosystems"的最后一题六选三的题目：
The process of succession and the stability of a climax community can change over time.
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Answer choices
○The changes that occur in an ecosystem from the pioneer to the climax community can be seen in one human generation.
○A high degree of species diversity does not always result in a stable ecosystem.
○The level of resilience in a plant community contributes to its long-term stability.
○Ecologists agree that climax communities are the most stable types of ecosystems.
○Disagreements over the meaning of the term “stability” make it difficult to identify the most stable ecosystems.
○The resilience of climax communities makes them resistant to destruction caused by humans.
答案给的是B,C,E,  但是完全想不通它的C是从哪里得出的？？？！！！求牛人指教。。。
另外，
The process of succession and the stability of a climax community can change over time.
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●
●

Answer choices
○The changes that occur in an ecosystem from the pioneer to the climax community can be seen in one human generation.
○A high degree of species diversity does not always result in a stable ecosystem.
○The level of resilience in a plant community contributes to its long-term stability.
○Ecologists agree that climax communities are the most stable types of ecosystems.
○Disagreements over the meaning of the term “stability” make it difficult to identify the most stable ecosystems.
○The resilience of climax communities makes them resistant to destruction caused by humans

我始终不太理解这篇文章里的pioneer community 和climax community是什么意思？即使在看过文章的中文翻译后。。。。。

快乐小水鱼UID: 2762984

哎呀，题目不小心多粘了一遍。。。