The origin of feathers predated the origin of flight; thus, feathers as an adaptation for flight is an example of

Exaptation

Explanation:

Exaptation:

it is referred to the process through which features acquire some unique function for which they are not meant for.

The fine example of Exaptation is Feather:

it has been mentioned and recorded from fossil record there are the ancestors of today's modern bird that are flightless but later in future, they adapt flight as an instrumental part of their life>

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answer; legislature;