I believe that would be considered an associates degree.
The inhalation of mercury vapor can produce harmful effects on the nervous, digestive and immune systems, lungs and kidneys, and may be fatal. Mild, sub-clinical signs of central nervous system toxicity can be seen in workers exposed to an elemental mercury level in the air of 20 μg/m3 or more for several years.
Well why where they fighting you did not tell us why?
A case study
I did that already
Thinking about causation involves the ability to identify, analyze, and evaluate the relationships among many historical events as both causes and effects. Historians often try to distinguish between immediate, proximate, and long term-causes and effects. Some events and conditions may have some correlation without proof of a direct causal relation while others are only coincidental or without a relationship