Turn now to just one way in which personal identity enters into the broader debate over abortion. Perhaps the most famous anti-abortion argument in the philosophical literature comes from Don Marquis, who argues that, because it is prima facie wrong to kill any entity with a future like ours, and because a fetus has a future like ours, it is prima facie wrong to kill a fetus (Marquis 1989). Peter McInerney and others, however, have denied that fetuses have futures like ours by appealing to