Eukaryotes Evolve

1800 million years ago

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In More Detail:

While the first definitive fossil eukaryotes are about 1800 million years old, there are also pieces of evidence hundreds of millions of years older that indicate that eukaryotes might have evolved much earlier than we thought. Scientists, including paleontologists and organic geochemists, are still trying to figure out when, how, and why this complex cell type first evolved.

image from Wikimedia Commons