Final answer:
Animal fiber hair has drawbacks such as different heat reactions, lack of natural reflectivity, and the need to be blended with human or synthetic hair.
Step-by-step explanation:
One drawback to using animal fiber hair is that it does not react to heat in the same way that human hair does. Animal fibers such as wool or fur have a different protein structure compared to human hair, causing them to exhibit different behaviors when exposed to heat. Another drawback is that animal fiber hair is not naturally reflective, which means it may not have the same shine or gloss as human hair. Lastly, animal fiber hair must be blended with either human or synthetic hair in order to improve its properties like manageability and strength.
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