如图所示在两个不同的地层中�现ab两种生物化石你认为哪种说法正确 A.物种a是由物种b进化而来的b.物种a比物种b数量多c.物种a Template




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tomski如图所示在两个不同的地层中�现ab两种生物化石你认为哪种说法正确 a.物种a是由物种b进化而来的b.物种a比物种b数量多c.物种a coloring