Harmonic unison and octave intervals are difficult to dis…

https://www.musical-u.com/learn/why-do-unison-and-octave-intervals-sound-the-same/
Harmonic unison and octave intervals are difficult to distinguish. It can be frustrating when taking a quiz, but it does reflect a real musical challenge. https://www.musical-u.com/learn/why-do-unison-and-octave-intervals-sound-the-same/