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 has increased the greenhouse effect? Answer: human actions
[EX A]: Human actions has increased the greenhouse effect.

[EX Q]: Question: What is the amount of product that may be produced by a reaction under specified conditions called? Answer: theoretical yield
[EX A]: The amount of product that may be produced by a reaction under specified conditions is called theoretical yield.

[EX Q]: Question: Fish use some of their fins to propel themselves through the water and others to do what? Answer: steer
[EX A]:
Fish use some of their fins to propel themselves through the water and some of their fins to steer.