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.

[EX Q]: Question: What is defined as the temperature plus precipitation of an area over a long period of time? Answer: climate
[EX A]: The climate is defined as the temperature plus precipitation of an area over a long period of time.

[EX Q]: Question: Loss of energy is the reason that what typically has few levels? Answer: food chain
[EX A]: Loss of energy is the reason that food chain typically has few levels.

[EX Q]: Question: What is produced by the reaction of metal oxide with water? Answer: soluble metal hydroxides
[EX A]:
Soluble metal hydroxides is produced by the reaction of metal oxide with water.