So that there isn't too much force restricting the structure of the circus and cause disaster
Answer:
Hypotheses must be testable, and once tested, they can be supported by evidence. If a statement is made that cannot be tested and disproved, then it is not a hypothesis.
You pick a system for which no control sample exists, so that no one can show that the alleged causal relationships you assert do not, in fact, lead to the phenomenon you claim to have observed.
Answer:
I believe it is luminosity and distance
Explanation:
So B
The first person to say the Earth orbited the sun was Nicolaus Copernicus