What would happen to a freshwater protozoan if removed from its normal habitat and placed into a saltwater pool?
a) loss of water through osmosis
b) gain of water through osmosis
c) loss of water through active transport
d) gain of water through active transport

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.