Morphology is the form and structure of an organism. It determines physical appearances and so helps to identify the individuals of a population. Some morphological features that show variations are: size, colour and fingerprints. Other triats such as height and weight of individuals. Variations of this features can be observed among individuals of a group.
Colour: in humans, skins, hair and eye (iris) are physical features that show colour variations. For example, hair colour varies from white, through many shades of blonde and brown to black.