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: On how many of the continents do birds live and breed? Answer: seven
[EX A]: Birds live and breed on seven of the continents.

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

[EX Q]: Question: Our global ecological footprint depends on resource use per person and what population factor? Answer: population density
[EX A]:
Our global ecological footprint depends on resource use per person and population density population factor.