That is exactly my point. People are conflating being alive (explicitly in this thread in the sense that a single cell is considered alive) with having a life that should be preserved. Complaining that if we found single celled life on Mars that we'd protect it even to our great inconvenience, but we will end a single cell or small group to save a host body, are making their argument based upon a false equivalence. Any life that might be found on Mars isn't ever posing a risk to a sentient host, and those defending harsh abortion controls because “all life should have a chance even single cells” don't extend “all life” to, well, all life.