Which organ is primarily responsible for digestion?


What is the chemical formula for table salt?


What is the main function of red blood cells?


Which vitamin is produced when skin is exposed to sunlight?


What type of bond involves the sharing of electron pairs?


What is the pH level of pure water?


Which of the following is a renewable source of energy?


What is the process by which plants make their food?


What is the primary gas in Earth's atmosphere?