Eukaryotes developed around

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(A) Eukaryotes are complex cells that evolved from prokaryotic ancestors through the process of endosymbiosis. According to evolutionary biology and t

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$1,600 \; 	ext{million}$ years ago

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(A) Eukaryotes are complex cells that evolved from prokaryotic ancestors through the process of endosymbiosis. According to evolutionary biology and the fossil record, the first free-living eukaryotic organisms originated in the oceans approximately $1.5 \; 	ext{billion}$ years ago, which is equivalent to $1,500 \; 	ext{million}$ years ago. Among the given options, $1,600 \; 	ext{million}$ years ago is the closest approximation to this timeline.

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