1:b
2:c
3:a
4:c
5:a
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If your talking singing lol. Then I would exercise the vocal cords. Like doing a little humming to a song you know, doing a few la la la's. But you always make sure you exercise your voice.
A unison interval occurs between two notes that are (D) identical in pitch. They can also be played at the same time with an identical length one octave apart, however not always necessary.