The parasitic placenta is not my thinking, it's a fairly widely understood, perhaps not anodyne, scientific description of the relationship. See: https://www.r

The parasitic placenta is not my thinking, it's a fairly widely understood, perhaps not anodyne, scientific description of the relationship. See: https://www.reading.ac.uk/news-archive/press-releases/pr9938.html#:~:text=The%20human%20foetus%20and%20placenta,particular%20diverting%20blood%20and%20nutrients https://www.reading.ac.uk/news-archive/press-releases/pr9938.... It's a topic of much, much discussion, and I don't believe that it's deranged to discuss how human pregnancy is particularly unique in the chemical and hormonal ways the placenta interacts with the uterine wall. Edit: for instance, human embryos attack and digest the urine wall, paralyzing the cells there and pushing growth hormones to the blood vessels to increase the blood supply to the placenta. Other mammals don't operate this way, the mother controls access to nutrients. Human embryos are so aggressive in seeking blood they typically leave behind clumps of cells throughout the mother's body, making the mother a generic chimera. In other mammals, the placental wall is not breached, so a failed or terminated pregnancy doesn't have the network of paralyzed and intertwined arteries that a human pregnancy does, making it much more dangerous for human mothers. The human embryo is nearly unique in it's aggression in seeking out arteries. One effect of human gestation is that the fetus has direct access to the mother's bloodstream, and injects hormones to regulate the mother's behavior - again, this manipulation is fairly unique - increasing blood sugar and blood pressure to serve the fetus even at the expense of the mother. A fetus may spend up to 25% of its protein intake on hormonal regulation of the mother (which, by the way, the mother's body tried very, very hard to shut down.) It's a complicated and hugely messy affair, and in humans represents a literal fight for resources.