A farmer uses an herbicide called triazine to control pigweed in his field.  Initially, the triazine works well and almost all the pigweed dies; but after several years, the farmer sees more and more pigweed.  Which of these is the best explanation for what happened? Group of answer choices:   Natural selection favored triazine-resistant pigweed, which was more likely to survive and reproduce. Some pigweed plants adapted to become resistant to triazine and passed the trait to their progeny. Natural selection caused the pigweed to mutate, creating a new triazine-resistant species. The herbicide company lost its triazine formula and started selling lower-quality triazine. Triazine-sensitive pigweed is less efficient at photosynthesis.

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Pre-Darwinian Concepts