In the word "unethical," the un-, ethic, and -al are all examples of morphemes.
Morphemes are the smallest units of meaning in a language, and they can be roots, prefixes, or suffixes. In this case:
- "un-" is a prefix (morpheme)
- "ethic" is a root (morpheme)
- "-al" is a suffix (morpheme)
So, the correct answer is morphemes.