The notion that all of life is genetically connected via a vast phylogenetic tree is one of the most romantic notions to come out of science.
How wonderful to think of the common ancestor of humans and beetles. This organism most likely was some kind of a worm. At some point this ancestral worm species divided into two separate worm species, which then divided again and again, each division (or speciation) resulting in new, independently evolving lineages. Little did these worms know, those hundreds of million years ago, that some of their number would end up evolving into beetles, while their brothers and sisters would end up as humans or giraffes.
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