1. Range of Factors Responsible for Change to Human Populations
... 21st century, and population numbers have reached over the 6.2 billion mark, growing by 78 million more each year. How has the world gone from 2 humans to billions of them? By a range of environmental and lifestyle factors. In ancient times people lived in small isolated communities. Birthrate was high, yet so was the death rate, resulting in the growth of people being ... ...
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