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.
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Question: Question: What is it called when two waves combine to create a larger wave? Answer: constructive interference

Answer: Constructive interference is when two waves combine to create a larger wave.


Question: Question: Acting like drawstrings to close off the alimentary canal, what regulates the passage of material between compartments? Answer: sphincter

Answer: Acting like drawstrings to close off the alimentary canal, the sphincter regulates the passage of material between compartments.


Question: Question: If only one atom of a specific type is present what is not used? Answer: subscript

Answer:
If only one atom of a specific type is present a subscript is not used.