Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: One gram of sugar or starch provides 4 calories of energy.

Answer: How many calories of energy does one gram of sugar or starch provide?


Question: Environmental changes is most responsible for the extinction of most species of plants and animals that have lived on earth.

Answer: What process is most responsible for the extinction of most species of plants and animals that have lived on Earth?


Question: Dimensional analysis is used to carry out metric unit conversions.

Answer:
What is used to carry out metric unit conversions?