1, the worm belongs to the class of polychaetes, is an aquatic animal, the shape is long like a centipede, there are a lot of pairs of legs, the body color of the red and green, the taste of the sweet, it is a kind of precious edible insects.

2, earthworms belong to the oligochaetes, is a terrestrial animal, the shape of long like silkworms, no feet, the body color purple and gray, the taste of fishy, is a useful soil improver.

3, the worm grows only in the topsoil of the paddy field at the junction of salt and fresh water, feeding on the rotting roots of the grain, there are two breeding seasons each year, the number is getting smaller and smaller, the price is getting higher and higher.

4. Earthworms are widely distributed, almost all over the world, feeding on organic matter, reproducing all year round, in large numbers and at very low prices.