The human activity most widely viewed as changing the planet is the burning of fossil fuels. ... to melt, threatening water supplies for hundreds of millions of people. ... and phosphorus to the biosphere than would occur naturally. ... compounds that can remain active in the environment for thousands of years .
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Answer: They were loyal to the British crown.
Explanation:
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Answer:
Developed advanced mathematical skills.
Explanation:
The Aztec and Incan Civilization was part of the ancient civilization that flourished before the arrival of the European in the New World after the discovery of America by Christopher Columbus.
Both of the civilization cultures developed complex mathematical systems and impressive advances in astronomy.
The Aztecs had their form of calculation where they used a base-20 number system.
I believe the answer is Barbed Wire.
Befor the inventions of barbed wire, the Cattles are let to roam freely across the plains and the owners are required to pay a lot of cowboys to supervise them so they didn't go missing. Witht he invention of barbed wire, they can keep the cattle in a secure place without supervision.
It was factory system assembly because then they had lots of companies that would make weapons for them
