Moroccans descended from Berbers, Arabs, and Black Africans exactly like the neighboring Maghrebians. The Berbers are the prehistoric populations of Morocco and are related to the wider group of Paleo-Mediterranean peoples. The Afroasiatic family may have originated in the Mesolithic period, perhaps in the context of the Capsian culture.
Epidemiologic triangle model of disease causation. A common model used in public health illustrates the relationships among an agent, a host and the environment. It applies to biological, chemical and physical agents.
Epidemiology. 1  Represents the reaction of lymphoid tissue to intrinsic or environmental antigens. 2  Most lymph node enlargements are reactive. 3  In children, most lymphadenopathies are benign; in adults, chance of malignancy increases with age.