Which of the following statements is part of the cell theory? A. Only plants are composed of cells.
B. All cells are produced from other cells.
C. Cells are one of several basic units of structure and function in living things.
D. Cells can be produced from nonliving matter.

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.