Eight-year-old Ella can use scissors to cut small paper dolls out of craft paper, something she could not do at age three. What best accounts for her improving dexterity?

Answer: Increased myelination of the central nervous system

Explanation: skill in performing tasks, especially with the hands is what is known as dexterity. According to the question Eight-year-old Ella can use scissors to cut small paper dolls out of craft paper, something she could not do at age three was due to her Increased myelination of the central nervous system. Her dexterity has improved, Myelin has enabled her nerve cells to transmit information faster and allows for more complex brain processes