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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
I'm not sure valid is the
I'm not sure valid is the best term to use, perhaps I mean "least wrong". Anyway, I think determining the best stories comes by accounting for a large numbers of observations (including observations over time) and through examining all the stories out there and using the story that best supports the observations gathered to that point.