All Life on Earth Comes From One Single Ancestor. And It's So Much Older Than We Thought.
Life on Earth had to begin somewhere, and scientists think that “somewhere” is LUCA—or the Last Universal Common Ancestor.
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Prokaryotic vs. Eukaryotic Cells: What's the Difference?
eukaryotic — which have two different types ... to keep out stray cats and burglars (the cellular equivalent to viruses or foreign materials), but you unlock the doors to bring in groceries ...