The repeated line "fair is foul and foul is fair" puts emphasis on the two and shows a connection between scenes
Soprano, Alto, Tenor, Baritone and Bass.
They used it in many situations especially in war, public spectacles , and church but I would say that they primary used it for entertainment or to form a sense of unity
When drawing a continuous line your pen/pencil never leaves the paper
Answer:
B. 3 or 4
If we are talking about a play without songs or excessive movement demands then a rule of thumb would be 3.5 to 4 full time weeks. In other words approx 120 - 160 hours with technical and dress rehearsals included, or without a minimum of 100-120 hours for a full-length play.