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: Which model can be used to trace genetic inheritance? Answer: pedigree chart
[EX A]: The pedigree chart model can be used to trace genetic inheritance.

[EX Q]: Question: What occurs when an unstable nucleus emits a beta particle and energy? Answer: beta decay
[EX A]: Beta decay occurs when an unstable nucleus emits a beta particle and energy.

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