ANSWERS: 3
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they all have the same last 4 letters :-P
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When the data storage system in any self-replicating body gets randomly altered (i.e. suffers mutation), this can result in a difference of capability in the next generation (i.e. a variation). Later changes in the support environment may favor the survival of one of these variants over another. Surviving variants can be regarded as successful adaptations.
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They all take place in the genes.
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