Question

evidence for evolution: vestigial structures
research each of these vestigial structures in humans.
summarize what its purpose was in our evolutionary ancestors

structure	picture of structure	original purpose
ear muscles of humans
goosebumps		i

Explanation:

• Tailbone (coccyx): In evolutionary ancestors, it was part of a tail which was used for balance, communication, and movement.
• Ear muscles of humans: In ancestors, they were used to move the ears to better detect sounds from different directions.
• Goosebumps: In furry - coated ancestors, they caused the hair to stand up, which could make the animal look larger to predators and also provided some insulation.

Answer:

Structure	Picture of structure	Original purpose
Ear muscles of humans	(No picture provided in answer, but can be found via a simple online search for "human ear muscles")	To move ears for better sound detection
Goosebumps	(No picture provided in answer, but can be found via a simple online search for "goosebumps mechanism")	To make hair stand up for intimidation and insulation