In the example of 'prehistoric', which part is considered the prefix?

The prefix in the word 'prehistoric' is "pre-." A prefix is a group of letters added to the beginning of a word that modifies its meaning. In this case, "pre-" means "before," which indicates a time period before recorded history. The root word "historic" pertains to events that have been documented and are part of history. Therefore, by combining "pre-" with "historic," the term 'prehistoric' signifies an era that precedes historical records. Understanding this structure is fundamental for word analysis and comprehension, especially in contexts like literature and history where the distinction between different time periods is relevant.