_______is a protein pigment that is responsible for different skin colour in humans.
Melanin
Melanin is a pigment that is found in humans. It gives colour to the hair, skin and eyes. If melanin is more, the skin colour will be darker.
Haemoglobin is a pigment that gives red colour to the blood. Carotene and chlorophyll pigments are present in the plants and gives reddish orange and green colour respectively.