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.

Example Input: Question: Carbon dioxide does not rise like other gases because it has a density greater than what? Answer: air
Example Output: Carbon dioxide does not rise like other gases because it has a density greater than air.

Example Input: Question: How are weather patterns formed? Answer: uneven heating of the atmosphere
Example Output: Uneven heating of the atmosphere form weather patterns.

Example Input: Question: What phenomenon is essential in order for evolution to occur because it increases genetic variation and the potential for individuals to differ? Answer: mutation
Example Output:
Mutation is essential in order for evolution to occur because it increases genetic variation and the potential for individuals to differ.