<span>The answer is the option C. hypothesis. If the option A, confuses you, think that an experiment is not per se an explanation, it is just a way to run trials to determine something. Hypothesis are statements that establish a possible relations between facts but that are not proved. Then you can design an experiment to test the validity or not of the hypothesis. You should not make hypothesis that cannot be testable. </span>
The temperature of a substance remains constant during a phase change.
Macronutrient include water, carbohydrates, fat and protein, so i'm going to have to go with
C. Vitamin C.
Food is moved through the digestive system by the contractions of two sets of muscles in the walls of the gut. One set runs along the gut, while the other set circles it. Their wave-like contractions create a squeezing action, moving down the gut. This series of wave-like contractions is called peristalsis.