Why do scientists test theories by comparing them with evidences describe a time when you tested a theory with evidences?

What is the scientific symbol for chlorophyll? What are facts about dishwashers? What is re-knob? Could you be pregnant if you have pregnancy symptoms but had a negative pregnancy test and you also thought you had your period but it wasn't normal and it was very light on the second day? Who invinted electricity? What does the word useless mean? What are the different types of pleadings? What was Montesquieu's ideas during the scientific revolution? Why is it important to use democratic method of choosing someone for a position of authority? According to a diagram outlined in your reading material the zigzag lines that connect the individual bones of the skull are called? How long does it take garbage to degrade? What did not lower conformity rates in asch's experiment? Can you go into labor while you are sleeping? If a researcher uses the same experiment setup as another study to collect data but uses different research subjects it is considered what? On question earlier last period was May 2 cycle was due the 23 of May have had no signs of it coming a couple of days of very light spotting but no period? How do you use mediocrity in a sentence? The striking molecular similarities that exist between Earth's many diverse species can best be explained by? What conditions would have to be met in order for an ambulance with its siren on not to exhibit the Doppler effect when it passes you? Rocks on either side of this move past each other without much upward or downward movement? What is the highest dive into water in meters?