Form a hypothesis about what substance or substances are produced in palisade cells but not in xylem cells

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

How does human environment effect the biosphere

Which of the following is not a possible effectof increasimg carbon dioxide levels in the atmosphere ?