Individuals of a particular northern tribe have been able to survive the increasing harsh winters that have been occurring over the past several generations due to shifting environmental atmospheric pressures by becoming more and more aggressive and looting the harvests of neighboring tribes while the more passive members of other tribes have disappeared due to starvation. This process of personality change illustrates the process of:

Question

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Natural selection is the process where individuals with traits better suited to their environment tend to survive and reproduce, leading to those traits becoming more common in the population. In this case, aggressive behavior is favored for survival.

Individuals of a Particular Northern Tribe Have Been Able to Survive