What is the density of water?
Average lifespan of red blood cells?
What happens to pressure when gas volume decreases?
Who discovered the photoelectric effect?
What percentage of the human body is water by weight?
What is the chemical formula of ozone?
Which line divides the Earth into Northern and Southern Hemispheres?
Which component of the human body primarily stores energy?
What is the powerhouse of the cell?
What gas do plants absorb from the atmosphere?
Which planet is known as the Red Planet?
What is the speed of light?
What is the chemical symbol for water?
Which country has the most natural lakes?
What is the smallest country in the world?