How has the definition of culture changed over time?

The attitudes, customs, and beliefs, which are the part of the society form the culture of the people. The culture is distinctive to each group of individuals and illustrates who they are. Though, under the right conditions, the definitions of the culture can modify.  

The change in the definition of the culture can take place from within, that is, via novel technological advancement or philosophical ideas. Another way by which the definition of culture can modify is via coming in contact with other cultures. When contact takes place between the two cultures, diffusion may take place. Diffusion refers to the conduction of ideas among the cultures.  

the answer is d.) homologous; have mammary glands