pre-history
Pre is the prefix history is the base word/root word.
Hope I was able to help. :)
The following group of words given above is a complete sentence. It is a complete sentence because it consists of a subject and a verb. The subject of the given sentence is "they" and the verb is "spoke". This sentence conveys a complete thought and only contains a simple subject and a predicate with its complement "before lunch".
Answer:
the purpose of our life is to be happy
He called everyone to a meeting and wanted to discuss something.
