Which suffixes require the combining form of root words to be used? check all that apply. -pexy -iatrist -ectasis -tocia -centesis -ic

The correct answers are: -pexy, -tocia, and -centesis. These are the suffixes that require the combining form of root words to be used. The combining forms are created with the combination of the word root and a vowel. Even though there are some exceptions, the combining vowel is used if the suffix begins with a consonant. If the suffix begins with a vowel (a-e-i-o-u), the combining vowel is not used. For instance, the suffix -centesis (puncture and aspiration of) requires a combining vowel to be used as in “paracentesis”: The doctor performed a paracentesis to remove fluid from the patient’s abdomen.

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