Which level of organization does the complete skeleton of a mouse belong to. a. cell. b. a issue. c. in oregon. d. an organ system. 2. an animal without a backbone is called a. a vertebra. b. an invertebrate. c. a chordate. d. an endotherm. 3. an animal that has body parts that are arranged around a central point has a. bilateral symmetry b. radial symmetry c. asymmetry d. a distinct head and tail end 4. structures an animal uses to exchange gases with its surrounding make up the. a. digestive system. b. respiratory system. c. excretory system. d. circulatory system 5. the inputs for cellular respiration are. a. nutrients and carbon dioxide. b. energy and carbon dioxide. c. nutrients and auction. denergy and auction oxygen. 6.the outputs of cellular respiration are. a. nutrients and carbon dioxide. b. energy and carbon dioxide. c. nutrients and oxygen. d. energy and oxygen. 7.an animal's which of the following body systems delivers nutrients and oxygen to cells. a. digestive system. b. respiratory system. c. excretory system. d. circulatory system. 8.the process in which an animal cell use oxygen and digested food molecules to release the energy in food is called . breathing cellular respiration diffusion gas exchange 9. two the body system responsible for the exchange of gases between the body and the environment is . digestive system respiratory system circulatory system excretory system 10.which of the following body systems work together to get cells and nutrients they need to carry out cellular respiration. a. the digestive and respiratory systems . b. the respiratory and circulatory systems. c. the digestive and circulatory systems. d. the circulatory and excretory system. 11.which of the following body systems work together to get cells the oxygen they need to carry out the cellular respiration. the digestive and respiratory system. the respiratory and circulatory system. the digestive and circulatory system. the circulatory and excretory system. 12. which of the following body systems work together to remove the waste products of cellular respiration from cells. the digestive and respiratory system. the respiratory and circulatory system. the digestive and circulatory system. the circulatory and excretory system.