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:
The gravitational pull of the moon as it orbits earth
B I’m pretty sure if not it’s d But I always say go with ur gut but B
No it is native to Southwestern Russia,The caucasus , and turkey. Despite its name, it is not native to Siberia
