Eukaryotic cells are thought to have

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Eukaryotic cells are believed to have first appeared about 2.1 billion years ago, which is much later than the appearance of prokaryotic cells. This is based on fossil evidence and molecular clocks, which suggest that eukaryotic cells evolved from simpler prokaryotic ancestors. Eukaryotic cells are generally larger and more complex than prokaryotic cells, and they contain many organelles that perform specific functions, such as mitochondria and chloroplasts.

Eukaryotic Cells Are Thought to Have