No single mechanism, it seems, can be studied in isolation; at a very basic level, factors like selection, drift, and epigenetics work together and become inseparable.
看起来不能孤立地研究某项单一结构；选择、漂变和试验胚胎学等因素在非常基础的水平上共同作用、密不可分。我们对曾经认为的直接进化过程了解越深入，就越能发现它们的奇妙和复杂。