What is the largest organ in the body?
Skin
Liver
Lungs
Brain
What kinds of cells help you fight infections?
Red blood cells
White blood cells
Tonsil cells
Cardiac cells
What is the chemical formula for water?
H2O2
H2O
HO2
H2SO4
What type of chemical reaction releases heat?
Exothermic
Endothermic
Hyperthermic
Hypothermic
What color does litmus paper turn in the presence of an acid?
Red
Blue
Green
Purple