Each hemoglobin molecule is made of four subunits, each containing a heme group that can bind one molecule of oxygen. Therefore, one molecule of hemoglobin can bind four molecules of oxygen. Oxyhemoglobin is hemoglobin bound by oxygen, and it gives oxygen-rich blood a red color.ach hemoglobin molecule is made of four subunits, each containing a heme group that can bind one molecule of oxygen. Therefore, one molecule of hemoglobin can bind four molecules of oxygen. Oxyhemoglobin is hemoglobin bound by oxygen, and it gives oxygen-rich blood a red color.
The Second Reich was Imperial Germany (1871-1918),  as unified by Bismarck in 1871.   Note. During the Weimar period (1919-33) the official name of  Germany was still Deutsches Reich..    ________     Hitler's regime was never officially known as the Third  Reich. The term was first discussed in 1923 by German historian  Arthur Moeller van den Bruck in his Book Das dritte Reich  (The Third Empire), which he hoped would soon come into beling.
The Allies would govern Germany through four occupation zones, one for each of the Four Powers--the United States, Britain, France, and the Soviet Union. The establishment of zones of occupation had been decided at a series of conferences.