How are ferns different from flowering plants? (Select all that apply.) Flowering plants are seedless.
Ferns are the only vascular plants
Ferns reproduce by spores.
Ferns are seedless.
Flowering plants reproduce by spores.

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.