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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
The model changes at the nano level.
At the nano level different rules apply. For example Gold is not longer gold color. The physical and chemical properties of matter can be different and so you can not continue to use the same model at nano-scale which BTW makes the investigation of nano materials extremely fascinating!
http://cnst.rice.edu/nano.cfm
Nano scale