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The original was posted on /r/biology by /u/Short-termTablespoon on 2024-04-02 22:21:38.

I’m relearning biology through the Campbell Biology textbook and they said “Trace life back far enough, and we reach the early prokaryotes that inhabited Earth over 3.5 billion years ago” which made me assume prokaryotes are the first living organisms and they evolved into eukaryotes. Now I’m just learning it again and know about natural selection so I have to wonder in what environment made prokaryotes evolve into eukaryotes and why? Also how did Eukaryotes cells evolve into whales and humans? I know these are complicated questions for me to ask considering I’m only on chapter one lol and I understand natural selection and how certain organisms traits in a population are more favorable for survival and reproduction in a certain environment than other organisms in that same population so I just wonder what about the environment made eukaryotic organisms? What “traits” evolved into eukaryotic organisms?