title: The evolution of placentation.
mesh_terms: D000663:Amphibians; D000818:Animals; D005075:Biological Evolution; D003338:Corpus Luteum; D005260:Female; D005399:Fishes; D000882:Haplorhini; D006801:Humans; D008394:Marsupialia; D051379:Mice; D010920:Placenta / Q000033:anatomy & histology*; D011323:Primates; D011817:Rabbits; D051381:Rats; D012104:Reptiles