Which two major factors influence the development of individual characteristics?

The development of individual characteristics is significantly influenced by heredity and environment. Heredity refers to the genetic information inherited from parents, which determines a range of physical and physiological traits such as eye color, height, and predisposition to certain diseases. This genetic framework provides the biological foundation of an individual.

On the other hand, the environment includes all external factors that can shape a person's characteristics after conception. These factors encompass a vast array of influences such as upbringing, cultural background, socioeconomic status, and personal experiences. The interaction between these hereditary factors and environmental influences is crucial, as individuals may express their genetic potential differently depending on the circumstances of their lives.

The balance between genetic predispositions and environmental conditions creates the unique individual traits that manifest in personality, physical appearance, and behaviors. Therefore, heredity and environment work together to mold individuals into who they are. Other options do not capture the comprehensive relationship between genetic and external factors as accurately.