Both of them and it isn't without some conflicts https://aeon.co/essays/why-pregnancy-is-a-biological-war-between-mother-and-baby … Unsolvable just like the Sorites Paradox https://plato.stanford.edu/entries/sorites-paradox/ …
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Ambos: el feto no vive sin la madre Pero sus células fetales contienen material de ambos padres
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