How is our topic like others?

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"Why perfume smells good" is also like "why can we see color". Both topics incluse 1 of your 5 senses. Also, the process of seeing and smelling are very similar since they both involve nerves sending signals to your brain.

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 Smelling perfume is also like how human eyes work,they are the same as your nose. Plus they're both 1 of our 5 senses.

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"why perfume smells good" is  like "microwaves". When you burn something in the microwave is has a specific odor,and when your nose detects the odor it uses the same process as it does with perfume.