The most fundamental divide in the diversity of living creatures is arguably the one between prokaryotes (=bacteria*) and eukaryotes (the tiny island of cumbersomely complex cells that consists of protists. And a couple insignificant lineages that are hardly worth talking about). Much of the earth’s biota seems perfectly content with small, streamlined genomes and similarly small, streamlined cell architecture. All but one group, that for some odd reason ended up with a membrane-bound package of a junky genome we call the nucleus.
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