Match each item to the time it best represents.
1. humans began using stone tools
2. birth ra...
Match each item to the time it best represents.
1. humans began using stone tools
2. birth rates declined, and the average life expectancy increased
3. the world population totaled six billion people
4. the annual population growth rate reached its peak
the late 1960s
Industrial Revolution
Paleolithic Era
1999
Answers: 1
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