the article talks about how anus may have formed, yet they don't mention embryonic development which usually kind of replays some evolutionary development:
this is why i used "some". The full recapitulation theory is obviously not true. The embryo development is an algorithm which gets branched and pruned in parallel with evolution and without deep rewrite, and thus it contains very recognizable major phases of evolutionary path to the given point that embryo belongs to.
Haeckel is "development of advanced species passes through stages represented by adult organisms of more primitive species" which obviously isn't true in general.
Our embryo though passes through the stages which were inherited from the embryos of our more primitive ancestors - the "embryo tree" structurally parallels and mirrors the evolution tree.
Yea, we learned that in highschool as well, too bad not everyone frequented this forum was afforded the privilege of going to a poorly funded public school in the inner city. Indeed facts about anuses where surprisingly easy to come by.
https://en.wikipedia.org/wiki/Embryological_origins_of_the_m...