Who can help me rank to Ambitious, or Virtuoso?

In musical notation, what specifies the number of beats in a bar? a notesb restsc ledger linesd time signature e barlines

True of false? green is the most used colors on websites

Natural minor half steps between scale degrees 3 and 4; 7 and 8 harmonic minor half steps between scale degrees 2 and 3; 5 and 6 ascending melodic minor half steps between scale degrees 2 and 3; 5 and 6; 7 and 8 major half steps between scale degrees 2 and 3; 7 and 8