下图是未被破坏的中生代和古生代沉积岩石的次序示意图其中Ⅱ层为含有物种a的化石Ⅰ层为含有物种b的化石请你据图回答 1比较物种a和物种 Template




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tomski下图是未被破坏的中生代和古生代沉积岩石的次序示意图其中Ⅱ层为含有物种a的化石Ⅰ层为含有物种b的化石请你据图回答 1比较物种a和物种 coloring