10. Which best describes the purpose of food? A
to kill bacteria
s. to prevent disease
c. to eliminate waste materials
o. to provide fuel for cell processes

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.