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.
Elements & Macromolecules in Organisms Most common elements in living things are carbon, hydrogen, nitrogen, and oxygen. These four elements constitute about 95% of your body weight. All compounds can be classified in two broad categories --- organic and inorganic compounds. Organic compounds are made primarily of carbon.