By 21-2 years of age, children's bodies have changed dramatically in appearance and proportions. What is the primary cause of this change?

Question

Quizplus · Accepted Answer

The primary cause of the dramatic changes in appearance and proportions in children's bodies by 21-2 years of age is the lengthening of the bones of the arms and legs through ossification, which contributes to an increase in height and body size. While muscle formation and increased nutritional intake may also contribute to changes in appearance, they are not the primary cause of the significant changes that occur during this time period. Myelination of the growth areas of the brain may contribute to cognitive development, but it does not directly affect physical appearance or proportions.

By 21-2 Years of Age, Children's Bodies Have Changed Dramatically