In earliest development, cultural influences take a backseat to the role of biology. With time, however, the impact of culture becomes more powerful. Cultural influences are subtle in the infancy, toddler, and preschool years. By middle childhood, cultural differences become more central as the child is educated in the specific ways of his or her culture. By adolescence, cultural differences are even more acute, as adolescents prepare to take on an adult role within their own culture.