Final answer:
The term gastroenteropathy contains two root words, 'gastro-' and 'entero-', with the suffix '-pathy', and does not include an additional combining vowel.
Step-by-step explanation:
The medical term gastroenteropathy consists of two root words, gastro- (referring to the stomach) and -entero- (referring to the intestines), with the suffix -pathy (indicating disease or pathology). There is no explicit combining vowel like 'o' or 'a' used in this term because the adjoining root words both end and begin with vowels. However, in medical terminology, an 'o' is often used as a combining vowel to ease pronunciation when joining two root words, particularly when the second root word starts with a consonant. In this case, gastro- and entero- naturally merge without the need for an extra combining vowel.