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.

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answer: zinc is the substance which has a volume of 1.38 .

density is defined as the mass of an object per unit volume.

it can be calculated by dividing mass of a substance by its volume i.e.

si unit of density is kg per cubic meter and cgs unit of the same is gram per cubic centimeter.

now from the given data volume can be calculated by the formula .

hence, the volume of aluminium will be = which comes out to be 1.703 .

similarly, volume of zinc, chromium, and nickel will be 1.378 , 0.869 , and 0.356 respectively.