Ubiquity hypothesis

As noted above, the hypothesis appears to be composed of two parts. The first is Everything is everywhere, that microorganisms are ubiquitous According to advocates of the ubiquity hypothesis. .. the vast population sizes of microorganisms drive ubiquitous dispersal. .. and make local extinction virtually impossible. Geographic isolation is therefore absent and as a result, allopatric speciation should be rare or nonexistent, which would explain the perceived low global morphospecies diversity of microbial eukaryotes. .. (Vanormelingen et al.. 

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