右图示一个长满蕨类的山谷谷底生长着�蕨在�蕨下面的枯朽倒木上则长满了苔藓和膜蕨这可能是因为 A．苔藓和膜蕨需要有机物维持生存 b．�蕨是 Sketch Coloring Page

右图示一个长满蕨类的山谷谷底生长着�蕨在�蕨下面的枯朽倒木上则长满了苔藓和膜蕨这可能是因为 A．苔藓和膜蕨需要有机物维持生存 b．�蕨是 Template

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