If the carrying capacity for the North Atlantic cod on the Grand Banks of Newfoundland is 500,000 tons, when do you expect that the rate of population growth would be greatest?

When there is 500,000 tons of cod on the Grand Banks
When there are 250,000 tons of cod on the grand banks
Where there are 50,000 tons of cod on the grand banks
When there are 550,000 tons of cod on the Grand Banks

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.