为什么鸟类作为恐龙的后代，生物学上被分为独立的“鸟纲”而不是蜥形纲蜥臀目下的“鸟亚目”？ 知乎 Sketch Coloring Page

为什么鸟类作为恐龙的后代，生物学上被分为独立的“鸟纲”而不是蜥形纲蜥臀目下的“鸟亚目”？ 知乎 Template

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