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.

[EX Q]: Question: What is the critical factor for the survival of segmented worms? Answer: water and humidity
[EX A]: Water and humidity is the critical factor for the survival of segmented worms.

[EX Q]: Question: Acting like drawstrings to close off the alimentary canal, what regulates the passage of material between compartments? Answer: sphincter
[EX A]: Acting like drawstrings to close off the alimentary canal, the sphincter regulates the passage of material between compartments.

[EX Q]: Question: What kind of behaviors are adaptive because they are flexible, capable of changing if the environment changes? Answer: learned behavior
[EX A]:
Learned behavior is adaptive because they are flexible, capable of changing if the environment changes.