There are developmental differences in the amount of gray matter in children. For example, around the ages of , the volume of gray matter in the caudate, a part of the basal ganglia involved in control of movement and muscle tone, peaks.

7 in girls and age 10 in boys

Explanation:

Around the ages of 7 in girls and age 10 in boys, the volume of gray matter in the caudate, a part of the basal ganglia involved in control of movement and muscle tone, peaks. This is one of the reasons as to why girls are more athletic and flexible earlier when compared to boys who develop more muscle tone later on in life.

the correct answer: the index of refraction of the second medium is lower i tried this persons answer and it was wrong this person is lying