If anything you would use a protractor but that’s not a answer.... so I would pick whatever relates to a protractor
The answer is: B) it has decreased.
A chemical change Is any change that results in the formation of new chemical substances .
I hope that's help and have a great night !
Answer:
The independent variable of an experiment is the one that is intentionally changed or manipulated to see the results of changing said variable.
We are told that in each different group, the amount of caffeine that is given to the dog's changes - in the control group, they get no caffeine, in the 2nd group, they get 10 mg of caffeine each, and in the 3rd group, they get 50 mg of caffeine each.
Therefore, since the amount of caffeine that is given to the dogs is the only variable that is being manipulated, this is the independent variable.
