Concept:Continuous variation refers to traits that show an unbroken range of measurements between two opposite extremes.
Explanation:Some traits in living organisms do not fall into fixed, separate groups.
Instead, they spread gradually from one extreme value to the other extreme.
Common examples include human height, body weight, and skin colour.
These features are controlled by many genes working together, so a population shows every possible intermediate form between the shortest and tallest, or lightest and heaviest.
This continuous spread of values is what makes the variation range wide and unbroken.
It differs from discontinuous variation, where individuals fall into clear-cut, distinct categories such as blood groups or tongue-rolling ability.
Since the question specifically mentions a wide range from one extreme to the other, it directly matches continuous variation rather than phenotypic, genotypic, or discontinuous variation.
Answer:C. continuous variation