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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
Authentic Assessment on scale
I would want a student to apply scale to a problem or situation that requires an understanding of scale and then share their work with others. Three parts--id a situation or problem in which scale is important, apply scale, share.
It could look differently depending on readiness of the student:
Apply scale to distances in the universe, draw something to scale, explore nanotechnology or virus spread...the student gets to choose the topic and the sophistication to match where they are right now.