经调查某生态系统中yxz分别为第一第二和第三营养级每个营养级不同物种的个体数量如图甲所示图中每一柱条代表一个物种一段时间后个体 Template




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tomski经调查某生态系统中yxz分别为第一第二和第三营养级每个营养级不同物种的个体数量如图甲所示图中每一柱条代表一个物种一段时间后个体 coloring