fun fact: i have the conspiracy theory that the USB symbol:

represents the phylogenetic tree of live. there's a big node right at the beginning which are all the bacteria that aren't really species (as i explained in another comment in this thread) but groups that can all exchange genes with each other and are therefore "one big species" and a lot of eukaryotic species that a long time ago developed out of them which only branch out, but don't come back.