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: Why did people stop adding lead to gasoline? Answer: environmental pollution
[EX A]: People stopped adding lead to gasoline because of environmental pollution.

[EX Q]: Question: Why is water important for the nervous system? Answer: to prevent dehydration
[EX A]: To prevent dehydration is water important for the nervous system.

[EX Q]: Question: What is one way of classifying organisms called? Answer: clade
[EX A]:
A clade is one way of classifying organisms.