In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Q: Question: Over 90% of the energy we use comes originally from what? Answer: sun

A: Over 90% of the energy we use comes originally from the sun.
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Q: Question: What type of transport requires no energy and occurs when substances move from areas of higher to lower concentration? Answer: passive transport

A: Passive transport requires no energy and occurs when substances move from areas of higher to lower concentration.
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Q: Question: When the helium is gone, the stars become what? Answer: white dwarfs

A:
When the helium is gone, the stars become white dwarfs.
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