use scientific evidence to support your answer
Theories can be changed or rejected if and when the scientific evidence no longer supports the theory.
Because although there is evidence to support the claims, it isn't possible to prove evolution indefinately.
modify the theory or discard it altogether.
There are no 'creationist theories' in the scientific sense. Creationist beliefs and scientific findings cannot be considered equivalent.
no only a virus can do that. some people believed that cold lowered your immune system but there is no scientific evidence to support this.
There is not enough evidence to support these new theories. More tests and research needs to be carried out before these theories can be proved.
You have it backwards. Theories are supported by evidence. Evidence is not supported by theories, evidence is simply observed.
Intelligent design, Hovind Theory Added: The above are not scientific theories but more ideological assertions in nature. No positive evidence supports either assertion.
why are theories sometimes replaced by new theories
Yes, they can, if new evidence is discovered to support a change in the theory. Physical theories are not provable in the sense of mathematical theorems. They depend on evidence, and they can be disproved if enough contrary evidence comes up.
They do the experiment again, double check all their calculations, then they come up with a new theory if it's necessary. That's why there's no such thing as a scientific fact, only scientific theories.
Experiments.
This a Study Island Question. The answer is "Scientific Theories are supported by evidence or data."
by falling in a hole
Scientific theories can be changed or replaced when there has been significant evidence for the change. The scientific method must be used to create a new hypothesis, which must then be proven.
when enough evidence contradicts earlier ideas
All are testable and falsifiable, and all have evidence to back them up. Without evidence, it is a hypothesis.