The Aquatic Ape Hypothesis
The aquatic ape hypothesis is the controversial idea that human ancestors went through a phase of living partly in water, and that this shaped many…
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Endosymbiotic Theory
Endosymbiotic theory explains the origin of the complex cells that make up plants, animals, fungi, and other higher organisms. It proposes that key…
Evolution by Natural Selection
Evolution by natural selection is the scientific theory that explains how the diversity of life arose and continues to change. It holds that…