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: The esophagus runs a mainly straight route through the mediastinum of what? Answer: thorax

A: The esophagus runs a mainly straight route through the mediastinum of thorax.
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Q: Question: If a substance does not release molecules into the air from its surface, it will not have what? Answer: smell

A: If a substance does not release molecules into the air from its surface, it will not have a smell.
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Q: Question: Trees release what gas as a byproduct of photosynthesis, thereby facilitating human respiration? Answer: oxygen

A:
Trees release oxygen gas as a byproduct of photosynthesis, thereby facilitating human respiration.
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