Concept:Morphological variation refers to differences in the visible physical structure or appearance of an organism.
Explanation:Size, colour, and fingerprints are all observable features of the body.
These features describe the form and structure of an organism.
Physiological variation, on the other hand, relates to internal functions rather than appearance.
Discontinuous variation involves traits with distinct categories, but these examples are not limited to that pattern.
Adaptive variation focuses on traits that help survival in a particular environment.
Since size, colour, and fingerprints are physical or structural traits, they are classified as morphological variation.
Answer:C. morphological variation