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。