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Cave painting
Cave or rock paintings are paintings painted on cave or rock walls and ceilings, usually dating to prehistoric times. Rock paintings have been made since the Upper Paleolithic, 40,000 years ago. They ... > more -
Genetic drift
Genetic drift is the term used in population genetics to refer to the statistical drift over time of gene frequencies in a population due to random sampling effects in the formation of successive ... > more -
Multiregional hypothesis
The multiregional origin hypothesis of human species holds that some, or all, of the genetic variation between the contemporary human races is attributable to genetic inheritance from either Homo ... > more -
Parallel evolution
Parallel evolution is the independent evolution of similar traits, starting from a similar ancestral condition. Frequently this is the situation in more closely related lineages, where several ... > more -
Toba catastrophe theory
According to the Toba catastrophe theory, modern human evolution was affected by a recent, large volcanic event. Within the last three to five million years, after human and other ape lineages ... > more -
American Alligator
The American Alligator has a large, slightly rounded body, with thick limbs, a broad head, and a very powerful tail. Males can weigh 500 lbs to over 1000 pounds; one American Alligator allegedly ... > more -
Precambrian
The Precambrian is an informal name for the eons of the geologic timescale that came before the current Phanerozoic eon. It spans from the formation of Earth around 4500 Ma (million years ago) to the ... > more -
Human evolution
Human evolution is the part of biological evolution concerning the emergence of humans as a distinct species. It is the subject of a broad scientific inquiry that seeks to understand and describe how ... > more
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