Which of the following is not part of the cell theory? (2 points) select one: a. every living thing is composed of cells. b. cells come from preexisting cells. c. cells are the basic unit and structure of all living things. d. every cells have a nucleus that contains genetic material.

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?