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.
Put all that together and the Bald Eagle is a white-headed sea eagle! It's the only sea eagle native to North America. Bald Eagles are mainly brown with a white head and tail. You may be wondering why they're called BALD Eagles when they obviously have white feathers on their heads. The name actually comes from an old English word â piebald â which meant âwhite headed rather than hairless. Bald Eagles live near large bodies of open water.