Short Answer
In attempting to construct a universal phylogeny,researchers analyzed several different gene sets.The results of this analysis are not congruent (see accompanying figure).The most likely explanation for this,as proposed by Carl Woese and others,is ________ [three words] in early populations,which would account for these discrepancies.
![In attempting to construct a universal phylogeny,researchers analyzed several different gene sets.The results of this analysis are not congruent (see accompanying figure).The most likely explanation for this,as proposed by Carl Woese and others,is ________ [three words] in early populations,which would account for these discrepancies.](https://d2lvgg3v3hfg70.cloudfront.net/TB4064/11ea3847_8926_8d62_9566_9dfc0eb7133c_TB4064_00.jpg)
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