Where does cellular respiration occur? A. in your stomach
B. in your lungs
C. in your circulatory system
D. in your cells

Of the groups of elements below, which are most likely to gain electrons to become anions? a. alkali metal b. boron group c. halogen d. transition metal

The number at the end of an isotope’s name is the number.

What produces wave a)sound b) heats c)transfer of energy d)vibrations