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 holds ionic and covalent compounds together? Answer: electrostatic attractions

A: Electrostatic attractions holds ionic and covalent compounds together.
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Q: Question: Which animal is preparing for a seasonal change in the environment? Answer: a squirrel storing nuts

A: A squirrel storing nuts is preparing for a seasonal change in the environment.
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Q: Question: What is used to convert concentrations to collisions per second? Answer: frequency factor

A:
Frequency factor is used to convert concentrations to collisions per second.
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