How is physical growth defined?

Physical growth is specifically characterized as an increase in body size and organ size. This definition relates directly to the measurable changes in an individual's physical attributes, such as height, weight, and the development of various bodily systems as a person matures.

The process of physical growth is a fundamental aspect of human development and is typically most pronounced during childhood and adolescence. It involves not only the growth of bones and muscles but also the development and maturation of internal organs, which are crucial for sustaining life and supporting the body's various functions.

Cognitive abilities, emotional stability, and social skills pertain to different domains of development: cognitive growth focuses on mental processes, emotional development deals with feelings and emotional regulation, and social skills enhancement involves interpersonal interactions and relationships. While all these areas are important facets of overall development, they do not directly relate to the physical changes and growth as defined in the correct answer.