LoriV3119 LoriV3119

21-10-2022
Biology

Answered

individuals of a fish species living in a river have varying oxygen level requirements. a nearby factory accidentally releases pollutants into the river, causing oxygen levels in the water to decrease. within a few generations, the percentage of fish with lower oxygen requirements has increased in the river. conversely, the percentage of fish with higher oxygen requirements has decreased. what form of selection has taken place in this population?

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