The return address is not required on postal mail. However, lack of a return address prevents the postal service from being able to return the item if it proves undeliverable; such as from damage, postage due, or invalid destination. Such mail may otherwise become dead letter mail.
do you have to have a return address on an envelope?
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Answer: no

The Lee Resolution for independence was passed on July 2 with no opposing votes. The Committee of Five had drafted the Declaration to be ready when Congress voted on independence. John Adams, a leader in pushing for independence, had persuaded the committee to select Thomas Jefferson to compose the original draft of the document, which Congress edited to produce the final version. The Declaration was a formal explanation of why Congress had voted to declare independence from Great Britain, more than a year after the outbreak of the American Revolutionary War. Adams wrote to his wife Abigail, ''The Second Day of July 1776, will be the most memorable Epocha, in the History of America'' -- although Independence Day is actually celebrated on July 4, the date that the wording of the Declaration of Independence was approved.
was the revolutionary war before the declaration of independence?
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Answer: yes

Speed describes only how fast an object is moving, whereas velocity gives both how fast it is and in which direction the object is moving. If a car is said to travel at 60 km/h, its speed has been specified. However, if the car is said to move at 60 km/h to the north, its velocity has now been specified.
is speed the same as velocity or acceleration?
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Answer:
no