What is the hardest natural substance found on Earth?

What is the boiling point of water at sea level in Celsius?

What is the unit used to measure atmospheric pressure?

Which gas do plants absorb from the atmosphere for photosynthesis?

Which human organ is primarily responsible for producing bile?

What is the pH value of pure water?

What causes the greenhouse effect on Earth?

Which organ in the human body is primarily responsible for filtering blood?

What is the study of heredity called?

Which part of the human body produces insulin?

What type of lens is used to correct nearsightedness (myopia)?