Which statement best describes one way that both plants and animals fight pathogens? a. both have an antigen–antibody response. b. both have a protective outer layer. c. both produce lymphocytes. d. both have a lymphatic system.

Which flexible structure that supports the nerve cord and led to the backbone

Which process in respiration happens first? a)pyruvate processing b)electron transport chain c)krebs cycle d)glycolysis

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