A combining vowel is unnecessary when the suffix starts with a vowel, as seen in examples like 'carditis'. It's important in terms where two or three combining forms are used or when the suffix starts with a consonant. This understanding aids in properly forming medical terms. ;
A combining vowel is unnecessary when the suffix starts with a vowel, such as in the term 'carditis'. It is important to use a combining vowel when combining forms are involved or when the suffix starts with a consonant. So, the correct answer to the question is A: The suffix starts with a vowel.
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