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: Lipids are available to the body from how many sources? Answer: three
[EX A]: Lipids are available to the body from three sources.

[EX Q]: Question: Which of the following traits is most influenced by the environment? Answer: Body weight
[EX A]: Body weight of the following traits is most influenced by the environment.

[EX Q]: Question: What do populations gain through births and immigration? Answer: individuals
[EX A]:
Individuals do populations gain through births and immigration.