An organ is a structure composed of two to four types of tissues working to perform functions that are beyond the scope of an individual tissue type. A set of related organs working cooperatively toward the performance of even more complex functions constitutes an organ system.
Advances in technology in the European Age of Exploration made possible for explorers to travel across the sea. Two examples of the many innovations could be the <em>Caravel</em>, a small to medium sized ship that was mostly used for fishing and exploring since it was fast and easy to maneuver, and the <em>Magnetic Compass</em> that helped explorers know what direction they were headed so they could reach their destination.
