- What someone does as a young adult has little
effect on their chance of getting cancer later in
life.

All organisms contribute some water to the water cycle by conducting

The science for classifying and naming organisms is known as

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.