This is really interesting -so far two sorts of features seem to warrant embracing things in our moral purview; one feature is that the thing in question should have feelings and the other is that it should have life. Of course, the immediate questions are what is it to have feelings - can single celled organisms have feelings, how about plants, computers? And what is it to have "life" - does a thing have to be made out of a certain sort of stuff, is the "life stuff" of an apple different from the "life stuff" of an armadillo, and what is life stuff anyway?
Any offers?
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