Which example best demonstrates the concept of metabolism? a. the oils in a nut yield energy for the squirrel. b. in the fall, a bear builds a den. c. a person is shivering in the cold weather. d. a mold grows in a damp area.

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