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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
Uncle Tom's Cabin
On a different note, Uncle Tom's Cabin is not something I would read on my own. I don't really enjoy the story and when we were questioned about it in class I really got to thinking. As I said in class, I don't like the way they make the slaves sound and it is hard to read and understand.
In terms of how long a book should be around before it can be considered a classic seems irrelevant. One could always compare it to previous classics and also try to guess as to whether is will be relatable to generations to come.