Invisible ink: During the Revolutionary War invisible ink usually consisted of a mixture of ferrous sulfate and water.
secret codes: Ciphers and secret codes were used to ensure that the contents of a letter could not be understood if correspondence was captured.
Mask letters: Search Results
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A "Mask Letter" is the name given to a method that the British used during the Revolutionary War to conceal a secret message. This method allowed the secret message to be hidden in plain sight. ... To discover the hidden message, the reader would place a "mask" on top of the letter to reveal the secret message
Explanation:
A. One is because school thinks wearing hats in a class IA a sign of disrespect to teachers and other students.
B. Another reason is because wearing hats could be blocking the view of other students sitting behind the wearer. In other words, it could deprive some students from learning or participating in class.
Answer:
The Agricultural Revolution
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