The mediastinum contains which of the following organs? A. Heart B. Esophagus C. Trachea D. All of the above

Select the true statements about eubacteria. most live as decomposers and heterotrophs. most only thrive in a narrow range of environments. certain eubacteria are responsible for food poisoning. eubacteria thrive in extreme environments.

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above

Identify two examples of chemical reactions that you have encountered during the last week. identify an exothermic and endothermic reaction. explain.