2. Explain why the narrator states that "pesticides were not always thought to

be harmful".

3. How does the chemical solution DDT work?.

4. Explain the relationship between Polio, Typhus, WWII and DDT.

Select the correct answer. which formula describes newton’s second law of motion? a. force=mass x accerlaration b. mass/accerlaration c. mass x volacity d. mass/ volacity

Robert wants to know which fertilizer will work the best for his grass. what can he do to explore this inquiry?

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