Slugs are mostly made of water, and CELLS. Every living thing is made of TONS and TONS of cells. Cells of a slug hold its water. A slug isn't happy if it doesn't have LOTS of water in its cells. If you sprinkle salt on a slug they will shrink and die :(

WHY?? Please include: OSMOSIS, HYPERTONIC, SALT, WATER, AQUAPORIN and CELL MEMBRANES in your response.