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Eukaryotes, organisms with a nucleus, first appeared in the fossil record 2.7 billion years ago, evolving from prokaryotic ancestors. They differ from prokaryotes in size, reproductive methods, and cellular structure, including specialized organelles. The presence of oxygen in the atmosphere was crucial for their evolution and survival, with significant fossil evidence indicating that multicellular eukaryotes emerged only after oxygen levels increased around 2 billion years ago.

Author

alyanipk

Language

EN