Which food has the greatest amount of polyunsaturated fat?

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.

How dose plate tectonics effect climate

Explain how the parts of the peripheral nervous system work with the central nervous system to produce a response to the stimulus