The chimera: More refutation of the existence of a soul

Humans, though less often and less mixedly than marmosets, have "chimeric" offspring. A bit of a twin's body material, from embryonic stage, may be in your body. That's especially true since uterine research show that many human "singleton" births, probably around one-quarter, started as twin conceptions, and one embryo was partially absorbed by the other.

So, if, as many conservative Christians claim, a soul begins at conception, what happens to it at the time of a chimeric absorption? While I'm not a Gnu Atheist or a village idiot atheist, issues like this must be raised, not just of fundamentalist and conservative evangelical Christians, but of all Christians, all Jews, all Muslims, and all metaphysical dualists in general.

Period.

Update, May 2, 2021: Fascinating Smithsonian piece here. If you're familiar with what chimeras are, namely a human fetus that has absorbed another in the womb, the discovery that moms can become chimeras from their fetuses is ... fascinating.