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Introduction. Definition of natural selection ; Relationship to genetic drift and evolution ; Restricted meanings of "natural selection" ; Modes of selection ; Summary -- Philosophical comments.

The Indigenous peoples of the Bolivian highlands are survivors. For thousands of years they have lived at altitudes of more than two miles, where oxygen is about 35 percent lower than at sea level.

How do intermittent events like hurricanes impact natural selection? How do animals adapt to challenging weather? A ...

The Indigenous peoples of the Bolivian highlands are survivors. For thousands of years they have lived at altitudes of more than two miles, where oxygen is about 35 percent lower than at sea level.