The differential distribution of wing length in Drosophila , with larger wings in northern areas and smaller wings in southern climates, provides evidence that:

A) wing length is not a heritable trait.
B) the fossil record is usually inaccurate.
C) the molecular clock cannot be applied to fruit fly traits.
D) chance is the most important agent in evolutionary change.
E) natural selection is the most important agent in evolutionary change.

Drosophila

A genus of small flies, commonly known as fruit flies, that are widely used as model organisms in the study of genetics and development.

Wing Length

The measurement of the wing from its base to its tip, an important factor in the flight capabilities and species identification of birds.

Northern Areas

Geographic regions located in the northern part of countries or continents, often characterized by specific climatic, ecological, or cultural attributes.