Question

Humans have a lot of homologous structures in common with other animals, and several of these structures are no longer in working order in human bodies. These nonfunctioning structures are called vestigial structures. They still show evidence of common ancestry, but they do not do the same things in humans as they do in other animals.%0D%0A%0D%0AListed below are mostly vestigial structures. Select the one that serves a purpose in humans.%0D%0A%0D%0A(1 point)%0D%0AResponses%0D%0A%0D%0Atail: tail bone in humans versus long tails for balance and communication in other animals like lizards and wolves%0D%0Atail: tail bone in humans versus long tails for balance and communication in other animals like lizards and wolves%0D%0A%0D%0Aear muscles: ability to wiggle ears in humans versus rotating ears to hear predators in prey animals like deer and rabbits%0D%0Aear muscles: ability to wiggle ears in humans versus rotating ears to hear predators in prey animals like deer and rabbits%0D%0A%0D%0Apelvis: supports upper body and attaches to lower body in humans versus being tiny and nonfunctional in legless animals like whales and snakes%0D%0Apelvis: supports upper body and attaches to lower body in humans versus being tiny and nonfunctional in legless animals like whales and snakes%0D%0A%0D%0Ahair raising: goosebumps in humans versus raising hackles to appear larger and aggressive in other animals like cats and monkeys%0D%0Ahair raising: goosebumps in humans versus raising hackles to appear larger and aggressive in other animals like cats and monkeys

Answer 1

The vestigial structures listed in the given responses are tail, ear muscles, and pelvis. However, the one structure that serves a purpose in humans is the ability to raise hair, which causes goosebumps. While this response also mentions the purpose of raising hackles in other animals, the ability to raise hair in humans still serves a purpose in response to cold temperatures, fear, or strong emotions. Therefore, the correct response is "hair raising: goosebumps in humans versus raising hackles to appear larger and aggressive in other animals like cats and monkeys".