Question

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.

Listed below are mostly vestigial structures. Select the one that serves a purpose in humans.

(1 point)
Responses

hair raising: goosebumps in humans versus raising hackles to appear larger and aggressive in other animals like cats and monkeys
hair raising: goosebumps in humans versus raising hackles to appear larger and aggressive in other animals like cats and monkeys

ear muscles: ability to wiggle ears in humans versus rotating ears to hear predators in prey animals like deer and rabbits
ear muscles: ability to wiggle ears in humans versus rotating ears to hear predators in prey animals like deer and rabbits

pelvis: supports upper body and attaches to lower body in humans versus being tiny and nonfunctional in legless animals like whales and snakes
pelvis: supports upper body and attaches to lower body in humans versus being tiny and nonfunctional in legless animals like whales and snakes

tail: tail bone in humans versus long tails for balance and communication in other animals like lizards and wolves
tail: tail bone in humans versus long tails for balance and communication in other animals like lizards and wolves
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Answer 1

The best answer here is:

pelvis: supports upper body and attaches to lower body in humans versus being tiny and nonfunctional in legless animals like whales and snakes

In humans, the pelvis serves an important functional purpose by supporting the upper body and providing attachment points for muscles and ligaments, as well as for the lower limbs. While it may be considered vestigial in legless animals, in humans it is crucial for bipedal locomotion and overall structure.

On the other hand, the other options describe structures that have lost their primary function, thus falling more closely under the category of vestigial structures without a significant role in modern human function.