单选题：图2表示的是在同一群落中两种动物种群数量的变化，它们的关系是（　　）。

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题目内容：
图2表示的是在同一群落中两种动物种群数量的变化，它们的关系是（　　）。
A．竞争
B．合作
C．共生
D．捕食

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