Concept:Visible physical features of an organism are called morphological traits.
Explanation:Members of the same species can look different from one another.
These differences are seen in features like height, skin colour, or leaf shape.
Such visible structural differences are known as morphological variation.
This is different from physiological variation, which deals with internal body functions.
Also, discontinuous variation refers to distinct categories such as blood groups, not generally to physical appearance.
Answer:B. morphological variation