Why do historians find periodization useful for the study of history?

Since humans tend to go through changes in periods over decades, and even centuries, it often makes little sense to give exact dates for every single instance of events. It is also a way for historians to put a general time period on an event. For example, we know that bronze became a product a long time ago, but we define its height of use during the Bronze Age. It helps generalize the 8,000 years of recorded history that historians sort through.

in contrast, the biological controls are self-sustaining, inexpensive and very effective once established. biological control could be used on thousands of golf course acres, improving their biodiversity and quality as wildlife habitat. in the process, the golf industry will be shown to be leaders in an environmental stewardship program of benefit not only to the lands they manage but also to the watersheds in which they exist.

you didn't post any options. a few things that spring is known to represent are: rebirth, birth, new life,   and life.