Upton Sinclair, Frank Norris and Ida Tarbell made their greatest contributions to the Progressive movement by (4) publishing books and articles to expose the problems of society. Upton Sinclair wrote a book which showed the dangerous and unsanitary lives workers of the Meatpacking District went through on a daily basis, Frank Norris exposed the struggle railroad workers go through with their bosses and the unfairness of the railroad workers life in California and Ida Tarbell wrote about the manipulative men behind the oil trade.
The history of slavery spans many cultures, nationalities, and religions from ancient times to the present day. However the social, economic, and legal positions of slaves were vastly different in different systems of slavery in different times and places.
The Answer Would be A. They Also learned working with bronze , building ships also use the sun and stars for navigation at sea of religious practices.
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The ability to walk upright and the development of the opposable thumb really signifies the shift from life in the trees to life on the ground. This is the main reason why it is important.
