evolutionary biology and anthropology Being able to digest meat -> meat being good for brain development -> huge evolutionary role for us humans placenta evolved due to an ancient virus that allows us to fuse things onto cells - if not for this virus we’d still lay eggs. The placenta’s role is to filter between host and baby to prevent rejection. Source “Looks like we’ve been domesticating viruses for a long time. Or have viruses been domesticating us?” Source Seeds parasitic combinations, symbiotic combinations there are worms that send off reproductive-butt-clones, ‘animals living fungal lifestyles’ (don’t remember source) kin selection theory of altruism - fittest family not fittest iindividual ...