What is the primary purpose of vaccines?


Which of the following is a characteristic of metals?


What is the primary function of the skin?


Which type of energy is stored in food?


What is the boiling point of water at sea level?


What is the main component of natural gas?


Which of the following is a non-renewable resource?


What is the primary function of the respiratory system?


Which of the following is a characteristic of acids?


What is the process of converting a liquid to a gas called?