The human population is in an era of growth.

Why did the federal government end its support of yucca mountain as a site for long-term storage of nuclear water

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.

Which of the following can be assumed about the layers in areas 2 and 4