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Abstract
excerpts.
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2 Billion Years Ago (+/- 100 million years)
Protozoa Evolve
Evolution
Nucleus and internal organelles
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.
Plants
Story
Did red algae descend from green algae?
Plant Evolution
Red algae did not descend from green algae. Both lineages split over a billion years ago, then adapted independently to different light environments.
Plants
FAQ