Time = Distance/Speed
T=81/40
T=2.025 hours
Answer:
The Neolithic Revolution
As more and more people began living in a localized space, the need for more plant resources grew, which produced a need for more consistent water than was provided by rain.
Explanation:
Answer:
<u>A) increased sophistication of tools.
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Explanation:
Technological advances have included significant developments in the production of flint tools, including fine-blade based industries instead of simpler and shorter shards. A sheath made of different materials and a stone tool for scraping and polishing made it possible to work on bones, antlers and skin. Advanced hunting spears and harpoons also appear during this period.