鸟是卵生动物。
鸡被作为卵生动物的代表，一些已经灭绝的爬行动物可能在进化过程中将基因传给了鸭嘴兽和其他哺乳类。
Chickens were included to represent egg-laying animals, such as extinct reptiles, that passed on much of their DNA to the platypus and other mammals in the course of evolution.
如果我们只看字面意思问题就变得很简单了，卵生动物在鸡类之前很早就出现了，所以技术上讲是蛋先于鸡。
The question would be simple if we took it literally, egg laying animals existed far before chickens came about, So technically the egg came before the chicken.
如果我们只看字面意思问题就变得很简单了，卵生动物在鸡类之前很早就出现了，所以技术上讲是蛋先于鸡。
The question would be simple if we took it literally, egg laying animals existed far before chickens came about, So technically the egg came before the chicken.
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