What can courtney change in her experiment to find the true impact of
the type of meals she eats on her race time?
select one:
a. for two weeks of her study, she can eat her high protein meal
for breakfast and high carbohydrate meal for lunch; she should
then switch the meals for the last two weeks.
b. she should try running a longer distance after lunch since
she seems to be faster regardless of her meal. c. she should only eat her high protein meals for breakfast and
only eat her high carbohydrate meals for lunch for all four weeks
of her study. d. she should eat only protein meals on some days and only
carbohydrate meals on other days, which can be determined by a
coin toss.

Time and quantity of food if changed or regulated sincerely then Courtney would be able to see the true impact of her type of meals

Explanation:

Suppose if Courtney chooses Option C as the choice of food for her race time, then her emphasis should be on two things in order to see the true impact of her meals -

a) The time at which food is taken  - For breakfast , she should try to take her food between 6 to 8 AM and not later than this.

b) The quantity of food - Quantity of food is very essential to maintain a good health which will in turn ensure better performance in race.

its like this, "if i give a plant an unlimited amount of sunlight,then the plant will grow to its largest possible size."

hope it let me know if it does or doesn't =^-^=

not sure if this is what you'r looking for eubacteria and archaebacteria