Question: Which are open, closed, or isolated systems? (1) a protein in solution in a sealed test tube, (2) the lungs, (3) a bird, (4) a

Which are open, closed, or isolated systems? (1) a protein in solution in a sealed test tube, (2) the lungs, (3) a bird, (4) a lake, (5) a biochemical reaction in a reaction tube, (6) coffee in a thermos flask.

I think 1 is isolated, 2 - 6 is open. is that correct?

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