Concept:Morphological variations are visible physical differences in the structure or appearance of an organism.
Explanation:The shape of the nose is an external structural feature.
Skin colour and hair colour are also visible physical traits.
Therefore, all three are classified as morphological variations.
Tongue rolling, however, depends on a person's functional ability rather than on any visible structural form.
It is a physiological variation, not a morphological variation.
Among the given options, tongue rolling is the character that does not belong to morphological variation.
Answer:D. tongue rolling