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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
Talking about the internal
Talking about the internal clock as Paul illustrated with the human in a cage without any idea of what time would be and without a clock or watch, every body is different but we all run a daily shift that is as close to 24-hours as possible.
In other words, I will like to believe that our students also have their own individual internal clocks as you mentioned. The only thing is that their clocks tick at different times. Those individual ticks may not be wrong or right. Each is just uniquely timed.
What we can do to address this in our society is to educate the community on the concept of individuality and children's readiness for various activities.