Image showing early stages of zygote development. Fun fact: Humans are deuterostomes, which means that when they develop in the womb the anus forms before any other opening. Which basically means that at one point you were nothing but an asshole.
https://realsocial.files.fedi.monster/media_attachments/files/110/203/918/525/599/682/original/2be245ada31e5eec.jpg