In Labrador retrievers, black coat (B) color is dominant to brown (b). Suppose that a black Lab is mated with a brown one and the offspring are four black puppies and one brown puppy. What can you conclude about the genotype of the black parent

Which of the following will not cause mass extinction? a. drastic change is weather b. geological change c. both a and b d. none of the above

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

Which of these statements are true about scientific theories and hypothesis