What is a vestigial structure?

Structures that have no apparent function and appear to be residual parts from a past ancestor are called vestigial structures. Examples of vestigial structures include the human appendix, the pelvic bone of a snake, and the wings of flightless birds.

Explanation:

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remnant of a structure that may have had an important function in a species' ancestors, but has no clear function in the modern species.

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your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.