useless trivia: What Word Means: To Hum - To Sing Softly?

Questions

it takes 12,000 head of cattle to produce one pound of----------?

it takes a sloth ---------- weeks to digest the food it eats?

---------- have one more pair of chromosomes than dogs or wolves?

jackals have one more pair of ---------- than dogs or wolves?

jackals have one more pair of chromosomes than ---------- or wolves?