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: stalactites are formed by deposition
answer:
The ceiling of the cave grew closer to the ground due to:?


question:
Fact: An example of combining two substances is pouring one substance into the other substance
answer:
An example of combining two substances is?


question:
Fact: an animal requires oxygen for to breathe
answer:

Animals are just like humans in that if they run out of oxygen, breathing is impossible and?