Answer:
the study of the structure, reaction, and composition of different kinds of substances
Explanation:

Regular exercise and physical activity promotes strong muscles and bones. It improves respiratory, cardiovascular health, and overall health. Staying active can also help you maintain a healthy weight, reduce your risk for type 2 diabetes, heart disease, and reduce your risk for some cancers.
According to my calculations I would say you ate something unusual or ate to much of something that made your stomach feel unpleasent
BMR or the Basal Metabolic Rate is the measure of the amount of calories that you burn if you were to do nothing but rest for 24 hours. So based on the given options above, the one that would have an increased BMR would be all of the above. Tim who is recovering from surgery, Mary who is pregnant, and Sally who is an avid swimmer. Hope this helps.
i believe its c good luck