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.
The range of bald eagles is spread throughout North America; from Florida to Eastern Canada on the East Coast; across the continent to northern Mexico and Baja California in the southwest; and then to the Pacific Northwest, Western Canada and Alaska. They will generally not be found in northernmost Alaska and Canada.