Which term describes a trait that evolved for one purpose but is used for another?

• A. Predetermination
• B. Exaptation
• C. Overridable
• D. Cultural feedback loops

Answer: (B)

Exaptation describes a trait that evolved for one purpose but is used for another. This concept captures how a feature can be co-opted for a new function over time, leveraging what already exists. A classic example is feathers: they likely started for insulation or display, and were later repurposed to enable flight. The important point is that the trait’s original reason for arising is different from the new use it takes on later.

The other terms don’t describe this evolutionary shift. Predetermination isn’t the standard term for a trait changing function; overridable isn’t about such functional reuses, and cultural feedback loops refer to how culture feeds back into behavior and trait development, not the biological repurposing of a structure.