. ____________________ environmental changes can cause the genes of an entire population to change. *
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Explanation:
Unfavorable environmental changes can cause the genes of an entire population to change.
Example:
Antibiotic resistant Bacteria :Antibiotics were use to treat bacterial diseases but due to excessive use to antibiotics some bacteria developed a antibiotic resistance genes in them and hence are now not effected by antibiotics.
DDT Resistant Pest : Excessive use of DDT as insecticide caused unfavorable condition to pest hence soon they developed resistance against DDT.
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