Suppose two students were experimenting with yeast to study cellular respiration. one student found glucose to be the most efficiently consumed sugar by yeast, whereas the other student found maltose to be the most efficiently consumed sugar by yeast. which of the following could explain the results

a. neither of the two answer choices could explain the results.
b. different organisms process food sources differently due to the availability of food and other environmental conditions. the students may have used different yeast strains.
c. either of the two answer choices could explain the results.
d. organisms have varying optimal conditions at which they work the best. the students may have used different temperatures or ph levels for their individual experiments.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project