Do you have all those charts saved? Or do you have a site you can share with them. http://arctic.som.ou.edu/tburg/products/realtime/strat/ that site doesn't load the images for me anymore.
I do as well. That’s why I said cis men can’t get pregnant, because it’s true by definition. The distinction between gender on the one hand, and chromosomes/assigned sex at birth on the other, is actually key to understanding transness (and not seeing it as “against human nature” or something.)