Your response and the comments you have sent me is well-received this end Story-Taller. What’s your real name?

I like your delving further into biological changes over time, and your placental comments are intriguingly interesting. I have a special interest in the development of the mammalian placenta.
Did you know that the three types of mammals found in Australia (where I’ve lived for over 30 years) … the Monotremes; the Marsupials and the Placentals … show (between them), the development of the placenta from the yolk-sac of the egg-laying mammals, through the limited-placenta of the marsupials to the more sophisticated placenta of the placental mammals?

By-the-way, I have just published my COVID Bulletin №9 titled: ‘Rats (1347) to R.A.T.s (2022):
https://medium.com/illumination/from-rats-1347-to-r-a-t-s-2022-911521e25017?source=friends_link&sk=67c13dff018977f06eb2b74b7e4905de

Thanks for your continued interest,
Fred