The three-domain system splits life into Archaea, Bacteria, and Eukarya, based on rRNA. But it's not the full picture anymore—my PhD work on marine microbes shows massive gene exchange between domains, blurring those old borders. The tree of life is really a messy web.
I see it in my data after long nights in the lab: a so-called "simple" archaeon carrying genes I'd bet my scooter belonged to a bacterium. So the textbook version feels too clean, like our apartment before my brother's college books explode everywhere.
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