Problem: Write a question you would see in a school textbook.

Answer: Which organ directly works to protect the human body from disease?

Problem: Write a question you would see in a school textbook.

Answer: Which process directly adds carbon into the atmosphere?

Problem: Write a question you would see in a school textbook.

Answer:
A group of students found metamorphic rocks near a campsite. The presence of metamorphic rocks is most likely evidence of