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: Early in the development of a human fetus, the skeleton is made entirely of what? Answer: cartilage
Example Output: Early in the development of a human fetus, the skeleton is made entirely of cartilage.

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 do you call sound that has a wave frequency higher than the human ear can detect? Answer: ultrasound
Example Output:
You call sound that has a wave frequency higher than the human ear can detect ultrasound.