Feathers Are an Example of A/an ________; They Originally Evolved

question 68

Multiple Choice

Feathers are an example of a/an ________; they originally evolved ________.

• A)homology; for flight
• B)adaptation; for some other function and only later became adapted for flight
• C)exaptation; in anticipation of future use in the development of flight
• D)exaptation; for some other function and only later became adapted for flight

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Definitions:

Arrector Pili Muscle

A small muscle attached to hair follicles in mammals, responsible for causing hairs to stand up when the organism is cold or frightened.

Apocrine Sweat Gland

A type of gland associated with hair follicles, found in areas like the armpits and groin, secreting sweat that contains fatty materials.

Sebaceous Gland

A small skin gland that secretes sebum (oily substance) into the hair follicles to lubricate the hair and skin.

Hair Shaft

The visible, non-living part of the hair that extends above the skin's surface.