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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
It's sort of odd to consider
It's sort of odd to consider the idea that the world around us could simply be a construction of our own minds and that we actually have no idea what our own reality is.
I don't think that "reality" can be placed in one category. There are things that surely exist outside of human conception- such as the sky and the trees, and even time. Though the earth, along with the basis of time, existed long before humans, time is very much a mental construction- individuals perceive time very differently based on their emotions, etc. Though it is a physical "reality", time is also a construction of the mind.