eukaryote

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eukaryote An organism whose cells have a distinct nucleus enveloped by a double membrane, and other features including double-membraned mitochondria and 80S ribosomes in the fluid of the cytoplasm (i.e. all protists, fungi, plants, and animals). The first eukaryotes were almost certainly green algae (Chlorophyceae) and what appear to be their microscopic remains appear in Proterozoic sediments dating from a little less than 1500 Ma ago.

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