About two billion years ago, early single-celled eukaryotic lineages diversified. Multiple branches emerged during this period, some of which would later give rise to animals, plants, and fungi. Among these were motile, heterotrophic forms traditionally called protozoa — representatives of several early eukaryotic branches, many of which still survive today.
Protozoa Evolve
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Protozoa Evolve
2 Billion Years Ago (+/- 100 million years)
Nucleus and internal organelles
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About 2 billion years ago, eukaryotic cells are defined by a membrane-bound nucleus and internal organelles. Their emergence created the structural foundation for complex life.
Subject: Evolution.
By 2 billion years ago, eukaryotic cells emerge with a membrane-bound nucleus and internal organelles (including bacteria organelles). Their emergence created the structural foundation for complex life. By compartmentalizing its own machinery, the eukaryotic cell gained efficiency, coordination, and flexibility.
Flashcard.
What defines a eukaryotic cell?.
Answer. membrane-bound nucleus, internal organelles.
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