If you want to control the experiment, you want to make sure that no outside factor could potentially influence your results.
Hence, changing the diet of a hamster would significantly alter any results you may collect.
For example, if you allow hamster A to eat a nutritious diet, while not giving a proper diet to hamster B. Hamster A will perform better, and run further and for longer, because he has more energy.
The answer is B, because you want to make sure no hamster is at an advantage.
According to Newton's second law of motion, the acceleration of a body is directly proportional to the force acting on the body and inversely proportional to its mass. The formula for this law is
Because D is definitely true and there is only one false sentence what means if that non of B or C is false because if one is false so other one needs to be too.
