What is the chemical symbol for iron?

In optics, what is the term for the point at which parallel light rays either converge or appear to diverge after passing through a lens?

What is the largest organ of the human body?

What is the main function of red blood cells?

Which moon of Jupiter is the most volcanically active body in our solar system, with plumes of water vapor and icy particles erupting from its surface?

What law of motion states that for every action, there is an equal and opposite reaction?

Which element is present in all organic compounds?

Which hormone is responsible for the development of secondary sexual characteristics in males?

What is the function of the respiratory system?

Which of Newton's laws explains the principle behind rocket propulsion?