Drag each label to the correct location on the chart. Determine whether each statement describes a V-Shaped Valley or a U-Shaped Valley.

1 formed by strong streams

2 formed from the erosive

3 action of glaciers

4 deeper than they are wide

5 form in mountainous regions

6 wider and more gradual base

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.