According to the textbook, which one of the following conclusions is most true regarding factors that influence brain development?

According to the textbook, which one of the following conclusions is most true regarding factors that influence brain development?

   Genetic factors have the strongest influence on brain development, particularly later in life.

Environmental factors and people’s experiences have the strongest influence on brain development in middle childhood.

   Together, brain development is shaped by genetic and environmental factors throughout the life span.

Environmental factors are particularly influential in abnormal brain development.