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: When magma reaches the surface through cracks in the earth's crust, what occurs? Answer: volcanic eruption
Example Output: When magma reaches the surface through cracks in the earth's crust, a volcanic eruption occurs.

Example Input: Question: What is the most numerous species on the planet? Answer: bacteria
Example Output: Bacteria are the most numerous species on the planet.

Example Input: Question: Which region of dna consists of one or more genes that encode the proteins needed for a specific function? Answer: operon
Example Output:
A(n) operon consists of one or more genes that encode the proteins needed for a specific function.