Who is Anthony Davis do I look like him

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.

Ihave a question. diplontic animals usually produce both eggs or sperm which are :

What blood vessels carry blood to the heart? away from the heart?