Natural selection favors copper tolerance in all soils near the old mine, not only in the contaminated soils. nearly 100% of monkey flowers growing in copper-contaminated soil are copper tolerant. copper contamination in the soil created copper-tolerant plants.
1. if you were to test monkey flowers growing on the shore of the lake, you would expect nearly 100% of them to be copper tolerant.
2. copper-tolerant plants are found only in contaminated soils.
3. the population that existed before mining must have included both copper-tolerant and copper-intolerant plants.
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