How does natural selection support the theory of evolution

Awave has a wavelength of 15 mm and a frequency of 6 hertz. what is its speed?

Which of the following forest management practices is best for reestablishing areas of forest?

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.