Abby and Sophie were in charge of bringing treats to their respective class parties. Abby decided to bring cupcakes for the boys in her class and brownies for the girls. Sophie brought Hershey bars and skittles for everyone in her class. They both took surveys of their classes afterwards, to see which treats were best. What common factor did Abby and Sophie both use in their experiment?

answer: cellular respiration takes in food and uses it to create atp, a chemical which the cell uses for energy. usually, this process uses oxygen, and is called aerobic respiration. it has four stages known as glycolysis, link reaction, the krebs cycle, and the electron transport chain.

alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".