In research methodology, the words proposition and hypothesis are often confused, and are often used with slightly different shades of meaning by different authors. However, the most popular view is that based on the existing literature in a field, a theory is built.
14 Where they live On a global scale, the sea eagle extends across the northern hemisphere from Siberia and Japan to Europe, and south to the Mediterranean and the Middle East. It is replaced by the bald eagle in North America, although it is the sea eagle that has colonised the southwest coast of Greenland.
Bald eagle range. The bald eagle is found across Canada and the United States of America, and marginally into Mexico. Vagrant individuals have also been recorded from Belize, Bermuda, Puerto Rico and the US Virgin Islands, and even as far away as Ireland.