Answer:
B.) join large groups traveling west.
Explanation:
or "Pioneers joined large groups in "jumping off" towns such as Independence, Missouri." Hope this helped!!
In the field of History, the following particular events occur:
- March 4: In the United states the republican Benjamin Harrison takes possession like President of the country.
- April 20: Adolf Hitler born.
- April 22: Oklahoma City, is founded.
- May 31: In Pennsylvania (United States) two days of copious rain break the South Fork dam, 23 km from the city of Jhonstown. 2209 people die.
- October 2: In Washington DC, the 1st Pan American Conference Begins it's sessions.
- November 2: South Dakota and North Dakota are the 39th and 40th states of the EE.UU
- November 8: Montana is the 41st state of EE.UU
- November 11: Washington is the 42nd State of the EE.UU
A.) Chinese communist leaders worked directly to serve rural peasants. Soviet leaders viewed themselves as guides for urban workers.
Plastic is a word that originally meant “pliable and easily shaped.” It only recently became a name for a category of materials called polymers. The word polymer means “of many parts,” and polymers are made of long chains of molecules. Polymers abound in nature. Cellulose, the material that makes up the cell walls of plants, is a very common natural polymer.
Over the last century and a half humans have learned how to make synthetic polymers, sometimes using natural substances like cellulose, but more often using the plentiful carbon atoms provided by petroleum and other fossil fuels. Synthetic polymers are made up of long chains of atoms, arranged in repeating units, often much longer than those found in nature. It is the length of these chains, and the patterns in which they are arrayed, that make polymers strong, lightweight, and flexible. In other words, it’s what makes them so plastic.
These properties make synthetic polymers exceptionally useful, and since we learned how to create and manipulate them, polymers have become an essential part of our lives. Especially over the last 50 years plastics have saturated our world and changed the way that we live.
The First Synthetic Plastic
The first synthetic polymer was invented in 1869 by John Wesley Hyatt, who was inspired by a New York firm’s offer of $10,000 for anyone who could provide a substitute for ivory. The growing popularity of billiards had put a strain on the supply of natural ivory, obtained through the slaughter of wild elephants. By treating cellulose, derived from cotton fiber, with camphor, Hyatt discovered a plastic that could be crafted into a variety of shapes and made to imitate natural substances like tortoiseshell, horn, linen, and ivory.
This discovery was revolutionary. For the first time human manufacturing was not constrained by the limits of nature. Nature only supplied so much wood, metal, stone, bone, tusk, and horn. But now humans could create new materials. This development helped not only people but also the environment. Advertisements praised celluloid as the savior of the elephant and the tortoise. Plastics could protect the natural world from the destructive forces of human need.
The creation of new materials also helped free people from the social and economic constraints imposed by the scarcity of natural resources. Inexpensive celluloid made material wealth more widespread and obtainable.
