Answer:
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Answer:
D. IRIS
Explanation:
Generally in humans and also in most mammals and birds, the iris is a very small circular structure in the eye, responsible for controlling the diameter and size of the pupil and also with the amount of light reaching the retina.
finallly eye color is also known to be defined by that of the iris
The science that describes populations is called Demography.
Demography is the study of human population dynamics. It entails the study of the size and density, distribution, and vital statistics such as births, marriages, deaths, aging, migration among other factors that affect a population. In other term is the Quantitive and qualitative aspects of human population.
