Why is it important to participate in class? How does participating benefit students? Teachers? Do the benefits increase when using the mic as opposed to using chat?

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It is much easier to remember something that you had an active part in learning, rather than something that was simply lectured to you. This is why Pokemon players can memorize the type-matchups chart after just a couple hours of battling but people have much more difficulty memorizing the contents of a slideshow. Participating mitigates this somewhat.