Final answer:
Melanin is the main determinant of an individual's complexion and skin color. Other pigments, such as carotene and hemoglobin, also contribute to skin color, especially in light-skinned individuals.
Step-by-step explanation:
The primary determinant of whether an individual's complexion is considered warm, cool, or neutral is the amount and type of pigments in the skin.
The main pigment that determines the color of human skin is called melanin.
Other substances, such as carotene and hemoglobin, also contribute to skin color, especially in light-skinned individuals.
Skin pigmentation is an evolutionary adaptation to the available sunlight in different regions of the world.