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Natural Selection in Action Chapter 7 Section 3 Changes in Populations Through ongoing natural selection, a population adapts to its environment. Well-adapted individuals will likely survive and reproduce. • Because of hunting, fewer elephants with tusks survive to reproduce, leaving more of the tuskless elephants to survive. • When the tuskless elephants reproduce, they pass the tuskless trait to their offspring. Insecticide Resistance Generation Time Definition: the average time between one generation and the next Insects: short generation time (hours or days) Humans: long generation time (80 years) Speciation Definition: the formation of a new species as a result of evolution Occurs after a group becomes separated from the original population New population adapts to new environment New population & old population are now so different that they can no longer mate successfully