Wings of birds and wings of butterflies contribute to locomotion. Explain the type of evolution such organs are a result of.

The correct answer is:
The wings of birds and butterflies are not anatomically similar in structure but perform the same function, hence these are analogous structures. This is a result of convergent evolution. The similar habitat of birds and butterflies has resulted in the selection of similar adaptive features (wings) in different groups of organisms, but towards the same function.

Step-by-Step Explanation:

1. Identifying the Anatomical Structure and Function:
When comparing the wings of birds and the wings of butterflies, we examine two different aspects: their anatomical structure and their function.
- Structure: The wings of birds are composed of an internal bony skeleton (forelimbs) covered by skin and feathers. On the other hand, the wings of butterflies lack bones entirely and are composed of thin, membranous sheets supported by chitinous veins. Thus, they are not anatomically similar.
- Function: Despite their structural differences, both types of wings are used for the same primary function, which is flight or locomotion.

2. Understanding Analogous Organs:
Organs of different organisms that have different evolutionary origins and internal anatomical structures, but perform similar functions, are called analogous organs (or analogous structures). Therefore, bird wings and butterfly wings are analogous structures.

3. Defining the Type of Evolution (Convergent Evolution):
Analogous organs are the result of convergent evolution.
Convergent evolution occurs when different, unrelated groups of organisms evolve similar adaptations or traits independently. This happens because they live in similar environments or share a similar habitat, which exerts similar selective pressures.
In this case, the need to fly in an aerial environment has led to the natural selection of wings in both birds and butterflies, guiding different ancestral lineages toward a common functional solution.