Answer:
Homeostasis is the process of maintaining a constant internal environment suitable sustaining life.
C. Allantois stores waste products produced by an embryo
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An error is that the scientist did not control their variables. They had one group of people playing the game at 6, and another group playing at 12. This means that other things might have affected the scores other than what was being tested, which was caffeine.
Answer:
C. Regulate how much carbon dioxide a country can emit
