Answer: as the sailers traveled they learned and brought people back and forth. The experiences they had changed them in that they would adopt parts of other cultures and they would spread their ideas.
An example is the use of corn. It was only grown in south America till the travelers came and saw how it fattened up the animals. They took the corn back with them to grow and feed their animals. Some people would eat it for themselves.
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The most important areas of Greek achievement were math and science. They achieved all kinds of things in the areas of psychology, astronomy, geometry, biology, physics, and medicine.
Ludwig van Beethoven was a German composer and pianist. He was a crucial figure in the transition between the classical and romantic eras in classical music and is considered to be one of the greatest composers of all time.