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

Which renewable energy source harnesses sunlight directly to generate electricity?

Which natural phenomenon results from the dispersion of sunlight through water droplets in the atmosphere?

Which gas makes up the highest percentage of exhaled human breath besides nitrogen?

Which everyday observation shows that pressure in a gas increases as temperature increases at constant volume?

Which flap of tissue prevents food from entering the trachea during swallowing?

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 gas is released when metals like zinc react with dilute hydrochloric acid?

Which everyday device changes the voltage level of alternating current for transmission or use?

Which natural process explains the formation of clouds in the atmosphere?