Final answer:
The history of humans from the time of Clovis and the Fertile Crescent to the present represents about 20 percent of the time from the first Homo sapiens to the present, with significant societal developments during this period.
Step-by-step explanation:
The history of humans from the time of Clovis and the Fertile Crescent to the present represents about 20 percent of the time from the first Homo sapiens to the present. This is based on the theory that modern humans emerged from Africa approximately 200,000 years ago and expanded out of Africa around 100,000 years ago, replacing other human species.
During this time period, humans have undergone significant development and advancements in societies. For example, around 10,000 years ago, humans discovered how to make good stone tools, marking the beginning of the Neolithic Age.
However, it is important to note that all human societies do not adapt and evolve at the same pace. The rate of development and progress can vary across different regions and cultures.