D is the correct answer. (Panting in a dogs increases the amount of cool air in nasal passages and lowers body temp).
Answer:
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<em><u>The Squamous Cell Layer</u></em></h2>
Explanation:
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the one that is considered a chemcial mutagen is : Tobacco Chemical mutagen refer to the substance that affected the DNA of those who consume the substancce or their offspring. Studies showed that consuming tobacco has proven to created DNA deformations for the fetus if it consumed by pregnant women.