It is cheaper than anything else. But that nuclear plant could explode etc. what I'm trying to say with the last part is that there is Good and Bad. I hope this helped.
Explanation:
During implantation, the trophoblast differentiates into two distinct layers: the inner cytotrophoblast, and the outer syncytiotrophoblast.
Too much risk, with many exemptions
False it is not normal yet some people may still do it
