Are dogs better pets than cats? How many stars are in the universe? In what type of light will a plant grow best? How many organisms have lived on Earth?
I gave my students this multiple choice question: Which question can be answered by scientific experimentation and observation?

Only one answer is correct among these 4 choices:
- Are dogs better pets than cats?
- How many stars are in the universe?
- In what type of light will a plant grow best?
- How many organisms have lived on Earth?

Could you tell me which one is correct?

In what type of light will a plant grow best?