The wars of Alexander the Great were fought by King Alexander III of Macedon (The Great), first against the Achaemenid Persian Empire under Darius III, and then against local chieftains and warlords as far east as Punjab, India.
What are the four most abundant elements found in living systems? There are 4 very abundant elements found in living systems. These 4 abundant elements are oxygen, carbon, hydrogen, and nitrogen.
3.1.1: Chemistry of Life. 1  Living organisms are composed of many chemical elements but the most frequently occurring elements are carbon, hydrogen, oxygen and nitrogen. As shown in Figure 1 below these four elements make up a majority of the human body, as well as most other living organisms.