Bolk's foetalization theory.
D000818:Animals; D000885:Anthropology, Physical / Q000266:history*; D005075:Biological Evolution; D049672:History, 19th Century; D049673:History, 20th Century; D015186:Hominidae; D006801:Humans; D009426:Netherlands; D010802:Phylogeny; D011323:Primates