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: Trees release what gas as a byproduct of photosynthesis, thereby facilitating human respiration? Answer: oxygen
[EX A]: Trees release oxygen gas as a byproduct of photosynthesis, thereby facilitating human respiration.

[EX Q]: Question: Which of the following structures is not present in animal cells? Answer: cell wall
[EX A]: A cell wall is not present in animal cells.

[EX Q]: Question: Which body part helps roundworm prevent their body from expanding? Answer: tough cuticle covering
[EX A]:
Tough cuticle covering body part helps roundworm prevent their body from expanding.