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.

Q: Question: Exposure to what can increase the amount of pigment in the skin and make it appear darker? Answer: ultraviolet radiation

A: Exposure to ultraviolet radiation can increase the amount of pigment in the skin and make it appear darker.
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Q: Question: Acting like drawstrings to close off the alimentary canal, what regulates the passage of material between compartments? Answer: sphincter

A: Acting like drawstrings to close off the alimentary canal, the sphincter regulates the passage of material between compartments.
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Q: Question: The cells of the blastocyst form an inner cell mass called the what? Answer: embryoblast

A:
The cells of the blastocyst form an inner cell mass called the embryoblast.
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