What would happen in an ecosystem without primary consumers? (3 points) a The populations of producers would increase. b The populations of decomposers would decrease. c The populations of omnivores would increase. d The populations of carnivores would increase.

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