A pregnant body is an anomaly. I mean this in a technical sense, because the body of a woman with a developing child growing in her belly literally does not fit into the system of categorization that’s long been the de facto standard for Western culture.
Is a pregnant body one person or two? If you believe the anti-abortion movement, the answer is clear: A pregnant body is two distinct persons and one of those persons — the woman — does not have the right to take away the “life” of the other.”
But this argument rests on a presumption about what constitutes a person.