Concept:Traits like size, height, weight, and colour display a smooth range of values between two extremes.
Explanation:In any population, these features do not appear as sharp, separate categories.
Instead, they show many intermediate forms, grading gradually from one extreme to the other.
Such features are controlled by many genes together and are also influenced by environmental conditions.
Because of this combined genetic and environmental effect, individuals show slight, continuous differences.
This pattern is known as continuous variation.
Continuous variation is different from discontinuous variation, where traits fall into distinct, non-overlapping groups.
Answer:C. continuous variations