Answer:
My first is twice in apple but not once in tart. My second is in liver but not in heart. My third is in giant and also in ghost. Whole I’m best when I am roast.
Describes universities like Harvard and can be poisonous.
At first, I am nothing. Add something to negate. Add again to oppose. Add again to find the time to draw. Add once more to find nobody at all.
This thing all things devours: Birds, beasts, trees, flowers; Gnaws iron, bites steel; Grinds hard stones to meal; Slays king, ruins town, And beats high mountains down.
What is eaten but not grown and was born in water but will disappear if soaked?
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.