How is a scientific law different from a scientific theory? A. A theory becomes a law after a long period of time has passed. B. A theory is why something happens and a law is how something happens. C. A theory is used for biology and chemistry and a law is used for physics. D. A theory cannot be disproved but a law can be disproved.

Which of the following matches the organisms described with the correct domain? a. archaea--multicellular, eukaryotic organisms that do not have cell walls b. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sources c. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycan d. bacteria--unicellular, eukaryotic organisms that always lack cell walls