Fairbanks Alaska but if you watch the video it will give you the actual answer, I just found that one online
The law of multiple proportion state that elements combine in small whole number ratio to form compounds. The law accounts for the stoichiometry relationship that exist among elements in a chemical compound.
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In addition to alerting the holder to the presence of classified information, markings also identify who classified the document and provides guidance for future downgrading or declassification.
What is classified information?
The term "classified information" refers to information that has been designated as such by a government agency for national security purposes that access to it must be limited and restricted.
All classified information and document as adequate protection is needed because they providing proper identification and guidance of future perspective on downgrading or declassification.
As a result, every piece of secret information and document must be labeled to indicate the information it contains has been downgraded or declassified in future.
Learn more about classified information, here:
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It spread through trainers and new innovations. Most popularly, the invention of the printing press.