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: Which tool would best help a person observe the parts of a plant cell? Answer: microscope
Example Output: A microscope would best help a person observe the parts of a plant cell.

Example Input: Question: In what way do all vertebrates reproduce? Answer: sexually
Example Output: All vertebrates reproduce sexually.

Example Input: Question: What causes a voltage to exist across the membrane in cells? Answer: difference in charges
Example Output:
Difference in charges causes a voltage to exist across the membrane in cells.