Music Theory · Scale Degrees & Identifying the Key

The 7th degree can be called two different names. What are they, and what single fact decides which one applies?

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More in Scale Degrees & Identifying the Key

Which scale degree is the supertonic, and where does its name come from?
Why is the mediant (3rd degree) such an important note when classifying a scale?
Two scales share the same tonic and dominant but differ in quality (major vs minor). Which degree tells them apart, and why?
Why is the leading tone described as "essential" for identifying a piece's key, especially in minor?
A key signature alone never points to exactly one key. How many keys does it give you, and which two?
Given the two candidate keys from a key signature, what is the simplest melodic clue that usually reveals the tonic?