Flies have only a single pair of functional wings, but their ancestors had two pair of wings. Thus, having two pairs of wings is a(n) _______ trait.

Name: Flies have only a single pair of functional wings, but their ancestors had two pair of wings. Thus, having two pairs of wings is a(n) _______ trait.
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The Answer of Flies have only a single pair of functional wings, but their ancestors had two pair of wings. Thus, having two pairs of wings is a(n) _______ trait.

Flies Have Only a Single Pair of Functional Wings, but Their