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: What is the critical factor for the survival of segmented worms? Answer: water and humidity

A: Water and humidity is the critical factor for the survival of segmented worms.
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Q: Question: Where are protons and neutrons located? Answer: central nucleus

A: Protons and neutrons are located in the central nucleus.
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Q: Question: Millions of years ago, plants used energy from the sun to form what? Answer: carbon compounds

A:
Millions of years ago, plants used energy from the sun to form carbon compounds.
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