Every person, family, and organization exists within a set of conditions (a system) and these conditions matter. Over a long enough period, we call the reaction to a condition 'evolution'. Different species of Galapagos finches, for example, rise and fall with the amount of rain. Sometimes the conditions lead to bigger birds with stronger beaks and sometimes the conditions lead to smaller birds with thinner beaks. The bigger beak birds burgeon because more rain leads to bigger seeds which the bigger birds gobble up. But size as a strength becomes a weakness during periods of less rain.
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