Answer:
out
Step-by-step explanation:
A prefix is an element that you add at the beginning of a word and it creates a different word with a different meaning. So, as the statement ask for a prefix to add to last to change its meaning to "last longer than", the answer is out because outlast means to exist longer than something.
The correct prefix is OUT. When you add "out", it means to live, last or remain longer than something.
Simple present: outlasts.
Present participle: outlasting
Past and past participle: outlasted
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