The anthropologist whose research showed that definitions of masculinity and femininity are not biological given but are learned cultural constructs and therefore subject to change is

The one responsible for the change is Margaret Mead—she is known for her publications and even studies that involves with anthropology, especially in the way her research had defined masculinity and femininity which is shown in the description above. These are all cultural and not based on biological.

no because it could make the world a terrible place to live in.