What are prefixes?

an element that comes at the beginning of a root word
an essential part of a root word
an essential part of a suffix
an element that comes at the end of a root word

an element that comes at the beginning of a root word

Explanation:

A prefix is an affix which is placed before the stem of a word. Adding it to the beginning of one word changes it into another word. For example, when the prefix un- is added to the word happy, it creates the word unhappy

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explanation:

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c -invasion by the moroccans.