Firstly lets take a look at what science actually is, how it works and some of the terms.
Firstly the scientific method as simply as possible
A simple 4 step method to form understanding about the real word.
1. look at the problem, look at the explanation......
2. try to form an explanation for the problem
3. try to form predictions if your explanation is true then these consequences follow
4. MOST IMPORTANT STEP test the predictions example: all object are equally effected by gravity therefore if you remove all other efects say put a hammer and a feather in a vacuum they should land at the same time.
Now this method is so successful that it is in a league of its own, everything from your PC, to the medicine that saves millions is a result of this method.
Terms commonly used explained a simply as possible
Hypothesis a purposed explanation of a phenomenon ( best guess)
Scientific hypothesis a hypothesis that can be tested
Working hypothesis is a previously accepted hypothesis (tested and it works)
Theory is a model of reality it basically best explains phenomenon in the real world
Facts are things known to be true
Evolution is a fact it is known to be true that species change, tough the methods behind why and how species change are theories.
Theories change all the time because they if some observation, experiment or new fact arrives that contradicts the theory then the theory never was an accurate description of reality therefore the theory was false and a new theory must be formed that accounts for all the previous facts, experiments and observations and this new one.
ID and Creationism works in an opposite way they have a "theory" <--- science.