instruction:
Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.
question:
Fact: if a tree is located near a sidewalk then the roots of that tree might crack the sidewalk
answer:
When tree roots grow, sometimes they?


question:
Fact: humans building homes in an ecosystem causes that environment to change
answer:
What is an example of humans building houses in a ecosystem and causing change in the environment as a result?


question:
Fact: carbon dioxide can be found in the air
answer:

A young boy is reprimanded by his mother for sleeping with his heavy blankets over his head. His mother is worried that if the boy continues to sleep like that, he will suffocate. This is because?