There's no document provided, I'll answer to the best of my knowledge
The abolitionist John Brown attempted to garner attention and do his part to abolish slavery by murdering three individuals who supported slavery, and later tried to host an armed uprising where he would lead slaves to raid a federal army in Harper's Ferry. The attack was unsuccessful, and he was later executed. His actions were radical, and in my opinion very misguided and would only lead to more violence.
That is my take on it, though I recommend you get your own opinion because that is a very opinionated topic.
Earth can be considered as a closed system, since it only receives sunlight (energy), while the overall mass stays constant, without (almost) any exchange from space. Another example of a closed system is a saucepan or frying pan, on a stove, when its lid is closed.
1)fraud or hacking. 2)rongrap
The independent variable is the amount of alcohol/alcohol and the dependent variable is car accidents. as the number of car accidents depends on how much alcohol the person consumed
