ancestry

Most people of European or African ancestry have the "wet" kind: thick and sticky..大多数欧洲或者非洲血统的人耳垢是湿的，厚的，有粘性的。

Martin has shown that, of the eukaryotic genes whose ancestry can be traced, 75 per cent or more came from bacteria rather than the host cell..马丁揭示，在哪些可以追溯到祖先的线粒体基因上，有75%或更多的成分来自当时外来的细菌而非宿主细胞。

You can only explain this by evolutionary common ancestry..你只能通过存在“进化上的共同祖先”来解释。