When technological advancement was necessary before scientists could begin to observe 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

What are charcteristics of lithosphere?

What are some possible short and long term medical concerns for crew members on longer space exploration trips