Answer:
A prefix
Step-by-step explanation:
Prefix is a letter or syllable added to a word to modify.
Kilo-gram
Kilo=10^3
It modifies the word 'gram'.
Kilo is a prefix
Prefixes are the beginning of words.
Thus KILOgram is at the beginning.
Suffix is at the END of a word
Unit is the body of the word
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