2. Why and how did railroads affect time zones in the United States?

In human beings had first begun keeping track of time they set the clocks to the local movement of the Sun

Explanation:

aug 15, 2012 - although van leeuwenhoek was not the inventor of the microscope, he advanced it more he loved to grind and focus a new lens in order to see the unseen world. most of leeuwenhoek's microscopes were silver. in a simple but significant experiment (1668), he demonstrated that worms found on

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