> The range of opinion within the view supporting different stages of viability and personhood to a fetus comes down to how rights and morality intersect. Marquis acknowledges that the anti-choice view of human being as a "biological category" creates a problem of determining the following:
[why that makes] a moral difference . . . If "human being," on the other hand, is taken to be a moral category, then the claim that a fetus is a human being cannot be taken to be premise in the anti-abortion argument, for it is precisely what needs to be established (26-7).
However, Marquis, who is anti-choice, says that pro-choice advocates cannot explain, though they insist on, "the connection between the psychological criteria for being a person and the wrongness of being killed" (27). Marquis concludes that it is wrong to ki
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