Afarmer is trying to determine why some weeds sprayed with weed killer do not die. i think it is the first one to begin a scientific investigation of this issue, what would be the first step for the farmer? research what others have already found. draw conclusions about the plants in his field. begin an experiment with a control group. analyze the data collected from the experiment.

How can you keep track of variables in a science experiment?

How do adaptation affect a species?

Next pretest: evolution select the correct answer in a laboratory population of flies, the female flies are gray and the males are yellowish gray. biologists observed that all the male flies had an equal chance for reproduction, but the male flies with the brightest colors were more likely to successfully reproduce. what phenomenon could explain such a change? a sexual selection b. disruptive selection c. stabilizing selection d. directional selection