Answer:
THEORY
Explanation:
Theory: The term theory refers to a particular group of ideas that tends to explain any relevant phenomenon. It can have different meanings such as, speculation or a guess about something, law about various things that can not be seen with naked eyes (evolution). Theory can be referred to as a tool that helps a person to identify a problem and to come to a conclusion of that problem.
Example:
1. Atomic theory.
2. Theory of evolution.
3. Quantum theory.
