7. What is one characteristic of the outer planets that make it not like the inner planets? * 7 points Outer planets are made of rock and inner planets are gas giants O Outer planets are gas giants, while inner planets are made of rock, Outer planets are extremely small, while inner planets are large O Outer planets do not have life on there, but all inner planets do.

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.