Why were the balkans known as the powder king of europe in the early 1900s

The Balkans region of Europe was called the 'Powder Keg' because they had many different competing nationalities, ethnic groups, and allegiances in their region. It was said that a match could set off the 'powder' that would impact the whole continent of Europe.

the of atp are the key to its ability to store and supply energy;

phosphate

the phosphate groups of atp are the key to its ability to store and supply energy. atp releases energy when it breaks bonds between its phosphate groups.

sitting in that one chair where he could get shot at was his worst decision.