Ascientist observed that during the course of a chemical reaction in the tissue culture of animal muscle cells, the number of atp molecules produced was greatly reduced. what did the scientist most likely hypothesize from the observation?

a.)oxygen availability became limited

b.)oxygen availability increased

c.)carbon dioxide availability increased

d.)carbon dioxide availability became limited

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.