Question

hannah is studying biology and notices that people have different skin colors. she learns that circulatory supply and pigment concentration and composition are the basic factors. what do these factors help to produce? to produce skin color for the presence of carotene and hemoglobin for sunlight and ultraviolet radiation oxygen supply to the skin

Explanation:

The question is about factors (circulatory supply, pigment concentration/composition) related to skin color. The first option directly connects these factors to producing skin color. The other options: carotene/hemoglobin are components, not the result; sunlight/UV are external factors, not produced by these; oxygen supply is part of circulatory but not the main production here.

Answer:

A. To produce skin color