What Italian cake shaped like a dove is traditionally eaten at Easter?

Colomba Pasquale

What monster has a multitude of serpent heads and regrows them when one is cut off? In Sudoku, how many smaller sub-grids are in one puzzle? In the Peanuts Halloween special, who awaits the arrival of the Great Pumpkin? What mineral is most important in oxygen transport in the body? What state did the United States purchase from Spain in 1819 that became a state in 1845?