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.
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Question: Fact: Matter in the liquid phase has variable shape

Answer: matter in the liquid phase has what shape?


Question: Fact: the smell of rotting meat attracts flies

Answer: What would a fly find most compelling?


Question: Fact: cold environments contain few organisms

Answer:
There are very few species of plants and animals in places like the North Pole because the temperatures are always very?