Houseflies have very tiny hind wings that are too small to lift them off the ground. Scientists have observed fossils of an ancient insect they believe is related to houseflies. However, these insects had second pair of wings that were much bigger. How does this show support for the theory of evolution?

The structures that are present in living things but are not functional, are referred to as vestigial structures. These structures were operable in the species' forebears but have since lost their operability due to evolution. The little hind wings of houseflies are vestigial parts that do not let them fly. However, the discovery of an insect with larger hind wings demonstrated that these wings were much larger and were used for flying in ancestral species of houseflies.

The comparison of the physical characteristics of various animal species in order to comprehend the adaptive changes that have occurred throughout their evolution from similar ancestors.

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