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
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
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
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
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
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3 answers
They all start with gill slits. Fish and some amphibians grow to have gills. Some amphibians, reptiles, birds, and mammals develop lungs to breathe air.
They all start with tails. Fish, some amphibians, reptiles, and birds grow tails. Humans do not keep their tails.
Fish and reptiles develop scales. Amphibians, birds, and humans have skin. Birds have feathers, and humans have hair.
With which animal do humans exhibit the most linear relationship?(1 point)
Responses
reptiles
reptiles
birds
birds
amphibians
amphibians
fish