*PLEASE ANSWER, ITS CONFUSING!! ASAP* Which of the following statements describes an interspecific zone?

a.) This zone measures 20,000 feet to 36,000 feet below the surface, and has a name that means "unseen."

b.) This zone measures from 600 to 3,000 feet below the surface, and is sometimes referred to as the “twilight zone” because of the amount of ambient light available.

c.) This ecosystem is in a transitional area that is influenced by the cycle between low and high tides.

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.