Hypothesis: It is basically a prediction of what an experiment will do. You are making a scientific guess to what is going to happen. After you make a hypothesis you will perform a experiment to test your hypothesis and to see whether your hypothesis was right or not. If it is then you are good to go (move on to make a data) if not then you have to do the project over again.
Research/ Experiment: Usually researching and experimenting are different kind of things but experimenting is basically what i said in the Hypothesis area, you are testing to see if your hypothesis is right or wrong. Usually researching means you are finding a source for your project. (Using source is a main thing when creating a project).
Last by not least theory: Theory is different from predictions or hypothesis. A theory is a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained. Example: My theory for the big bang theory is... and you put your theory in it.
Hope this helped :) <span />
Answer:

Cost : The expenditure incurred by a producer on the factor as well as non-factor inputs for a given amount of output of a commodity.
The energy is released when the bond between the 2nd and 3rd phosphate group is broken forming (ADP)adenosine diphosphate.
Hey, sorry about the person who gave you a virus... pretty sure most people who leave links are doing similar things unfortunately. The answer is Archaebacteria I’m pretty sure. Eubacteria are found everywhere, Fungi are mushrooms, protists exist all over underwater areas. Haven’t researched it in a while but hope this answer helps :)