Question

a appears at the beginning of a medical word, like a signal light * 1 point
prefix
root word
combining vowel
suffix
a appears at the end of a medical word. it can change to root * 1 point
into an adjective, a noun or a verb.
prefix
root word
combining vowel
suffix

Explanation:

Prefixes are word - parts at the start of a word. Suffixes are at the end and can change the word's part - of - speech. Root words are the core of the word, and combining vowels join word parts.

Answer:

1. A. prefix
2. D. suffix