Which organ produces insulin in the human body?
What is the chemical symbol for gold?
Which gas makes up 78% of Earth's atmosphere?
Which law states "for every action, there is an equal and opposite reaction"?
What causes tides on Earth?
What is the basic unit of heredity?
Which era did dinosaurs dominate?
What fossil fuel is formed from ancient plants?
Which planet is known as the "Red Planet"?
What is the pH of pure water?
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