The first historical era, more than 5,500 years ago, is called____________and refers to a time before people developed writing.

In the Gregorian calendar, events are dated either before or after the birth of_________

A group of ten years is known as

The remains of plant and animal life from an earlier time are called_______

Some early calendars developed by the Chinese, Egyptians, and Hebrews were based on the cycles of the______

A group of 100 years is know as

The Gregorian calendar

The study of human culture and how it develops over time is called

The most important fact that helped scientists connect the discovery of the skeleton, Lucy, in Africa to modern humans was that it

One thousand years is

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