Which household water purification method uses ultraviolet light to kill bacteria and viruses?

Which hormone is responsible for the fight-or-flight response?

Which scale measures the hardness of minerals, with diamond being the hardest at 10?

Which vitamin is essential for good vision?

Which planet in the solar system is known as the Red Planet due to its iron oxide rich surface?

Which everyday device measures the voltage or potential difference between two points in a circuit?

Which renewable energy source harnesses heat stored inside the Earth to generate electricity?

Which naturally occurring radioactive element was discovered by Marie Curie and named after her home country?

Which phenomenon is responsible for the formation of a shadow?

Which common food borne bacterial disease causes prolonged fever and is transmitted through contaminated food and water?

What is the primary function of the respiratory system?