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Where can you really draw the line? Could you survive in space without any air or equipment? Even if you could, where did the equipment and air come from?
Photosynthetic organisms are for all practical purposes part of your lungs
Me needing something doesn’t make that thing me, right? I need the sun to survive but neither the sun is part of me / I am part of the sun. Like, are you your skeleton? What about the other parts that are not bones then?