What process can cause water in aquifers to become brackish and unusable for agriculture?
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Biology, 22.06.2019 05:00, Goldenstate32
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Biology, 22.06.2019 08:50, eyeneedalife
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Biology, 22.06.2019 10:30, jagslovegirl
Natural selection changes allele frequencies because some survive and reproduce more successfully than others.
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