20.某草原生态系统的食物�如图所示.1图中食物�较简单因此该草原生态系统的自动调节能力较差除图中所示的生物类群外该生态系统的生物 Template




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tomski20.某草原生态系统的食物�如图所示.1图中食物�较简单因此该草原生态系统的自动调节能力较差除图中所示的生物类群外该生态系统的生物 coloring