Write an incorrect answer to the given question based on the associated fact. You are also provided with the correct answer to the given question. Make sure that your incorrect answer is relevant and similar to the associated fact. Also, try to make the incorrect answer similar to the correct answer so that distinguishing the correct answer from the incorrect answer is not very easy. Make sure you don't accidentally provide another correct answer! Also, make sure they sound reasonable (e.g., might be on a school pop quiz). A good incorrect answer can be constructed using words associated with the question, but not the correct answer. For example, for the question "What helps plants survive?", using words like "weeds", "vase", "bee" (associated with "plant"), or "first aid", "parachute", "accident" (associated with "survive") etc. Your incorrect answers make the question hard, so these results in good incorrect answers.

Fact: cycles of freezing and thawing water can cause mechanical weathering. 
Question: What can cycles of freezing and thawing water cause this type of weathering? 
Correct Answer: mechanical.
earthquakes.

Fact: chemical weathering causes iron in limestone to oxidize. 
Question: chemical weathering causes iron to oxidize in what? 
Correct Answer: limestone.
clouds.

Fact: Mammals that are therians house the embryo until it is complete during pregnancy. 
Question: Mammals that are what house the embryo until it is complete during pregnancy? 
Correct Answer: therians.

extinct.