Final answer:
Heredity does not cause onychorrhexis, unlike other factors like insufficient use of cuticle removers, injury to the matrix, and aggressive filing techniques.
Explanation:
Onychorrhexis is the medical term for brittle nails. Among the options given, heredity does not cause onychorrhexis. Factors such as insufficient use of cuticle removers, injury to the matrix, and aggressive filing techniques can contribute to this condition.
Learn more about causes of onychorrhexis here:
https://brainly.com/question/38510798
