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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
Even though there are many
Even though there are many "things that have not been able to be explained by humans yet", they can still be imagined and thought about and thus perceived by the brain even if not directly. Even things without names, things you don't have images for, things you don't fully understand: if you can think of the idea, and there is the possibility for you to understand that idea more fully, it exists.