Which of the following forces could be used in electronic devices? spring

applied

magnetic

gravitational

What is the name of the two satelites on mars

Regarding most of the narrator’s story, which word best describes the tone?

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.