Answer: Type of paper and force of throw.
Explanation:
Depending on the type of paper, the weight may change which will affect the throw. For the reason he is testing the <u>shape</u> affecting the flight, and not the weight, the paper would have to be the same kind. The force of the throw could also affect the distance, so that would also have to stay the same in order to be properly tested.
Answer:
A.It takes a lot of different tools to fight disease.
B.Modern technology is an important part of the fight against disease.
D.Different types of scientists use different tools to fight disease
Explanation:
I would think it is d but it could be c