Part of it was it brought up another article for trading
It depends how far back you are talking about. If you are talking back to the 1700s it would be cotton. If you are talking about a time period even father back than that, sorry, I can't help. Hope this helped.
Scientific observation corresponds to the method of testing hypotheses by unobtrusively watching and recording participants' behavior in a systematic manner.
<h3 /><h3>What is the purpose of scientific observation?</h3>
It consists of scientific research, where the researcher does not interfere with his personal opinions in the study, but rather collects data through different methods, such as documents, interviews and experiments, to measure a hypothesis.
Therefore, scientific observation helps to obtain knowledge through a complex and rigorous methodology to make the study more reliable.
Find out more about scientific method here:
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The control of the u.s of most of the north america territory
In 1452, German engraver Johannes Gutenberg invented the printing press and changed the course of history. ... The printing press used movable type to transfer words to the printed page. It allowed books to be produced cheaply and quickly.
