Here are some science questions you can use:
Easy:
- What is the process by which plants make their own food?
- What gas do humans need to breathe in to survive?
- What is the boiling point of water in Celsius?
Moderate:
4. How does gravity affect objects on Earth?
5. What is the function of the human heart?
6. Why do we experience day and night?
Hard:
7. How does DNA determine the traits of an organism?
8. What is the difference between a chemical change and a physical change?
9. How do vaccines help prevent diseases?

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