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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
Not having a "human" atom
Not having a "human" atom or an "alive" one really struck me. Before, I had thought carbon as being the "alive" atom. Carbon, however, does not make the compound "alive". It just happens to be the things that are/were alive, but it is in other stuff also. Before, I would have said that carbon was the key to "life", but now that I think about it, there cannot be any specific "life atom".