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enter image description here I was looking at this image and reading through the Wikipedia page for viruses and it says that to satisfy the definition of "being alive" the organism must have a cellular structure, but it seems to me that if an organism has all these other factors without a cellular structure, it is still seemingly alive, no?

So why exactly does an organism need a cellular structure to be alive? What is the rationale for that criteria?

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marked as duplicate by anongoodnurse, David, mgkrebbs, Amory, The Last Word Jan 22 '18 at 16:42

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  • $\begingroup$ A quote I remember from the Campbell's Biology textbook said something like "if you take all the individual components of a chloroplast and put them all together in a tube, you won't have a functional chloroplast"... That's why the structure of a cell and its organsiation matter, even if it doesn't explain why the structure is absolutely necessary for a cell to work. Similarly, the textbook would say that having all the pieces of a bike in a box won't lead you anywhere, but a little bit more structure could make a bike and lead you somewhere. I hope these examples can help. $\endgroup$ – justdoit Jan 17 '18 at 7:03