Why are fossils of some cetaceans homologous stuctures?

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

Nucleic acid certain protein cell membranes certain carbohydrates

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays