Smoke filling up a room is indeed an example of diffusion. Diffusion occurs when two or more sets of molecules intermingle and spread out. In this case, it would be the smoke molecules interacting and spreading out among the air molecules.
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future diary: Mirai Nikki
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During is a preposition
that is a determiner
epidemic is a noun
early is an adjective
warnings is a noun
circulated is a verb
widely is an adverb.
