I always like to go back in time to find answers needed today. We don’t know if the gene deletion occurred in only one or several common ancestors, but one thing is clear:
Conditions in the location where it took place must have been ideal for Rh negatives at one point.
One of the key differences in Rh negatives is our lack of the protein also responsible for ridding our bodies of toxins.
One of the health benefits salt water (ocean water) carries is that swimming in it “sucks toxins out of our bodies” which we otherwise may have a hard time ridding ourselves of.