Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Q: The long, threadlike extensions of the nerve cell help transmit nerve impulses.

A: Which part of the nerve cell helps transmit nerve impulses?
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Q: Phototaxis is the term for movement toward light.

A: What is the term for movement toward light?
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Q: The tilt of earth on its axis causes summer to be warmer than winter in the northern hemisphere because the rays of the sun strike the northern hemisphere more directly in the summer.

A:
Which of the following statements best explains why the tilt of Earth on its axis causes summer to be warmer than winter in the Northern Hemisphere?
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