Why are common names not always useful to biologists?
a. they require the use of a dichotomous key.
b. they are in latin.
c. they are too long.
d. they can apply to more than one animal.

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.