Answer:
A theory would be entirely replaced if a new information is discovered that contradicts with the previous theory.
Step-by-step explanation:
Theories are made after being properly investigated and by having a large amount of supporting data.
But theories can be subjected to entirely change and be replaced if a new theory comes up that contradicts with the previous theory. As science is an emerging field and new researches are conducted day by day so previous theories can be wrong. However, the new theory should have enough evidence and reasoning to prove that the previous theory was wrong.