Answer:
Both are a type of affix.
Both can change a word's meaning.
Step-by-step explanation:
Prefixes and suffixes are both types of affixes. An affix is something that is placed at the beginning or end of a word to modify its meaning. The suffix /-ology/ can be added to a root word to change the meaning to /the study of/ whatever the word is. The prefix /de/ can be added to a root to indicate that something is going down; /a/ can be added to show it is going up. For example, the words ascend and descend use these prefixes to show where something is going.