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 do muscles need to contract? Answer: stimulus
[A]: Muscles need stimulus to contract.


[Q]: Question: Which single most factor is responsible for the extinction of hundreds of species of birds? Answer: human actions
[A]: Human actions is responsible for the extinction of hundreds of species of birds.


[Q]: Question: The amniotic egg first evolved in what species? Answer: reptiles
[A]:
The amniotic egg first evolved in reptiles.


