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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
authentic asssessment
If I had to come up with an assessement, I suppose I would come up with a list of different activities that would allow the studnets to explain or discuss what they understood about scale. Maybe models,essays, demonstrations and oral presentations etc. I would create a rubric for myself to check off the points that I would be looking for in any of the above presentations. I would also leave the opportunity for studnets to refine and resubmit their project, if better understanding came while watching or listening to other studnets projects.