Cara and chuck were looking at pond water through a microscope. they saw this image. cara wondered what it was. chuck said it had to be a living thing because it was
a) green.
b) moving.
c) made of cells.
d) round throughout.

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