question: Write a question you would see in a school textbook.
answer: Which of the following is the best estimate of the number of stars in a typical galaxy?

question: Write a question you would see in a school textbook.
answer: Pepsin is an enzyme that acts in the stomach for protein digestion. Which of these is most likely the main role of pepsin in this metabolic reaction?

question: Write a question you would see in a school textbook.
answer:
A caterpillar changing into a butterfly is an example of