question: Rolando wants to see at what temperature various liquids boil. He boils tap water and records the temperature. He then boils tap water with milk added and tap water with sugar added. What is the purpose of boiling plain tap water first?
choices.text: to include a factor to manipulate to have a possible explanation to a problem to change one variable while observing the others to provide a standard by which to compare the results
choices.label: A B C D