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.

Question: What once most common bird in north america became extinct in the 1800s? Answer: the passenger piegon
The passenger piegon once most common bird in north america became extinct in the 1800s.

Question: Which part of the atmosphere do greenhouse gasses trap heat in? Answer: troposphere
Troposphere part of the atmosphere do greenhouse gasses trap heat in.

Question: What is the primary cause of air movement in the troposphere? Answer: differences in heating

Differences in heating is the primary cause of air movement in the troposphere.