Which statement best describes an organ? A. Cells of one type work together to carry out a function.

B. This is the simplest level of organization of life.

C. This is the most complex level of organization of life.

D. Different types of tissues work together to carry out a function.

Which of the following is an example of a tissue on the digestive system a. the stomach b. smooth muscle that lines the stomach c. nerve cells in the stomach d. enzyme molecules in the stomach

Match with o for organic and i for inorganic for each compound

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen