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the answer is d . a measurement   how can artists measure the width of the human face to use drawing for correct proportions

option c (nickel) is not found in earth's crust. the earth's crust basically contains eight (8) elements namely: oxygen, silicon, aluminum, iron, calcium, sodium, potassium and magnesium (listed in order of abundance).

i believe the answer is: a.  abstract forms were often used to represent human figures.

representing human figures in abstract forms is often used in the geometric period, not hellenistic  period.   during the hellenistic  period,   aesthetic value derived from creating arts which mimic the actual shape of a certain object or individuals.

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it demonstrate the egyptian kingdom love for the natural world

this is beacause beside the hippos blue gaze,the body was painted with the outlines of river plants, which symbolizing the marshes in which the animal lived. the figurine of the hippo named willian originates from the middle kingdom during the 12th dynasty.