What is the function of the respiratory system in the human body?

What is the chemical symbol for phosphorus?

Which blood type is considered the universal donor?

In a chemical reaction, what is the term for substances on the left side of the arrow?

In the human nervous system, what is the role of the myelin sheath?

What is the process of a substance changing from a gas to a liquid called?

What is the function of the gallbladder in the digestive system?

Which space telescope has provided stunning images and valuable data about the universe since its launch in 1990?

What is the term for the process by which rocks are physically broken into smaller pieces without changing their composition?

What is the term for the process by which ice changes directly into water vapor without melting?