Answer:
A.Hot air rising,cold air sinking
Explanation:
Hot air rises in a confined or closed space.That is one of the reasons why firefighters have some people crawl on the flour to get out. the smoke is hot air so it rises to the ceiling of the room, while cold air stays lower.
Consumers are living beings in a food chain that eat creatures from a particular species.
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It lasts about 90 minutes for a normal person.
B I think I really just took an educated guess to help
Confirmatory is the type of drug test measures the amount of a drug in the specimen.
Others:
qualitative
quantitative
immunoassay