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（　　）。

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

参考答案：

答案解析：

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