Which change in a sample of pond water could indicate that heterotrophic microbes were active?

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

What statements describe a host organism?

What is the difference between an igneous, sedimentary and metamorphic rock