What is the difference between a “change in demand” and a change in “quantity demanded.”

1.
What is the difference between a “change in demand” and a change in “quantity demanded.”
2.
What is the difference between a “change in supply” and a change in “quantity supplied.”
3.
Holding demand constant, what is the only thing that can cause a change in quantity demanded? What are the things that cause a change in demand?
4.
How do changes in income affect the demand for a good?
5.
How do substitute and complementary goods affect the demand for a good?

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