56:25 All of the following are examples of a primary source except:
a.
your history textbook
b.
a letter from the President
c.
the United States Constitution
d.
a photograph of a civil rights march

A Text book

Explanation:

Text books tend to be very one sided and they might leave things out or lie to make them seem like the "good side"

a substance in a physical state in which it does not resist change of shape and will expand indefinitely to fill any container.

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