What is a fiber that is found only in mammals?

What is a fiber that is found only in mammals?

  • Correct Answer: feathers
  • muscle
  • muscle
  • hair

Explanation: Hair is a fiber that is found only in mammals. Its main component is keratin. A hair shaft consists of dead, keratin-filled cells that overlap each other like the shingles on a roof (see Figure below ). Like roof shingles, the overlapping cells help shed water from the hair.

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