Definitions: The study of religion is _________.?

Questions

Because baby pigs grow so quickly, a succession of 48 little pigs were used in the title role during the filming of the 1995 movie hit ----------?

Mallard ---------- are sometimes built at a height of 40 feet above ground. Surprisingly, when leaving their nests for the first time, chicks are very rarely hurt due to falling to the ground.?

Fish travel in schools, whales travel in pods or ----------?

Because birds carrying messages were often killed in flight by hawks, medieval Arabs made a habit of sending important messages ----------?

Many corals receive nourishment from algae which grow inside their ----------?