During a new moon or full moon the illumination portion of the moon is not visible at all from earth because earth is between the sun and the moon or the moon is between earth and the sun

Ineed to know why d is the correct answer asap

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

Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates