How can a single Vida flower soak up all the blood in human body? Even if they're small children, there's still too much blood for a single plant to contain.
Well, they ain't normal flowers, so.....
What living thing is able to acquire intelect or any properties from their meal? If you have at least basic idea about how digestion works, you'll come to conclusion it simply can not work since it's necessary to break the meal down to the most basic chemicals. Nucleotic Acid is the most complicated molecule we know an on top of that it's incredibly vulnearable. One does not absorb absorb a DNA molecule intact. Also there are no explicit genes for specific traits so not even properly processing the DNA may get you what you want.
Maybe the demons' brains function more or less like some RL animal brains, that is, the nutrition in an animal's diet determines how their brains are formed/develop (i.e, why koalas are literal smooth brains). It's not the best expo but it kinda works, just with a more "supernatural" spin on it.
As much as I really like the series, something about it has always bugged me. Women can be trained from a young age to become Mothers or Sisters if they're not sent off to be eaten. Isabella is shown being pregnant at one point, but my question is: How exactly did she get pregnant? How can any woman get pregnant in the environment they're in? Are some boys trained up to be seed bearers whose sole purpose is to impregnate women and give birth to more food for the demons? Or do they go through some sort of artificial insemination process? You can't just magically get pregnant, and the process of having a child involves sex between both sexes. There has to be some explanation for how all of the children are even born in these kinds of circumstances.
I’ve always presumed they were artificially inseminating the women. They have some kind of sperm bank at the ready, or they use the males who were intelligent and/or physically capable enough to be worth keeping around like Norman. We’ve seen several adult males working under the Ratri family. It’s not out of the question that the surviving males could’ve been forced to donate their sperm, and then the Mamas had no choice but to get artificially inseminated and pregnant so that they could supply more and more kids to the system. Maybe they will even play with the genetics and choose which man’s sperm goes to which Mama, so they can ensure a higher quality offspring. Direct contact between a man and woman isn't necessary, but still Unfortunate Implications all around.
A quick flashback of Isabella in the fourth volume confirms that it's artificial insemination.
How did Bayon and his associates hunt and kill so many children without hurting the farms' stocks, even if they tried to limit their number of kills? We are told at first that he hunted once a month, but his hunts got more frequent to the point where he has the hunts once every three days. The kids are implied to come from the Premium Farms and if their numbers are anything like what we saw in Gracefield, Bayon's hunts look like they would kill the children faster than they could be bred.
They didn't kill all 50-or-so children they had at Goldy Pond. I think it was Nous/Nouma who said "if we decrease their numbers we will have to wait until the next hunt" so it's more probable they reach to a quota of deaths and then they retreat until next time and restock.
While I understand the Lambda experiments creating massive humans, bigger humans means more meat, what would lead to the test subjects getting Super-Speed like Hayoto or Zazie? What kind of idiot scientist does experiments on livestock that don't increase the amount of food it provides, but instead makes it better able to escape you or kill you with their bare hands?
Just remember that demons gain traits from the things they eat. It's the whole reason why smarter kids are premium meat.
Did Emma unintentionally break part of her promise to the One? Because he declares that, in addition to losing her memories, she'll "never see her family again". Yet in the finale, she ends up seeing them again anyway, though she doesn't get her memories back.
The way I saw it is that is that she's not seeing them again of her own accord because she's not "Emma" anymore.
How can one Mama possibly take care of thirty-odd children alone? Even with older kids helping younger kids, the oldest are only eleven and Isabella has a room full of one year olds with her through the night. Just one baby is enough to completely exhaust two parents.
Maybe the "demons" have drugs that make babies sleep all night long?
Or there's more than one "Mama" and they're assigned to different groups of kids, though we did have Sister Krone help look after the kids, so there's probably other Mamas and Sisters that we don't see.
By offloading as much work onto the kids as possible. The older girls take care of the babies in preparation for Mom training, and the older boys probably take charge in things like preparing meals. Older kids look after younger as much as possible, and most if not all of the chores are offloaded to them too so the Mom has as much time and energy as she can spare to manage the kids.
Because of how intelligent the children are, and how self-sufficient they're seen to be, it's likely that they're relatively free-range and, as stated above, the children spread out the house chores. It's likely also that this is why Sisters are kept on standby even when there's only one Mom per house. In the event anything happens, like any assistance being required or a lot of children getting sick, it's likely that a Sister or two is sent to the house to help get things back in order. And remember, all of the Moms are also former children of the house, and have undergone hellish training to earn their positions. So it's likely that any girl who's worked her way up to Mom status has exhibited the same downright frightening levels of hypercompetence as Ray, Emma, and Norman, just focused solely on taking care of the house and children.
Unfortunate Implications all around.