Why do leeches dead when salt is sprinkled on them?

Leeches die when salt is sprinkled on them due to osmosis. Salt creates a hypertonic environment, causing water to move out of the leech's body cells to balance the concentration of salt outside. This dehydration leads to cellular damage and ultimately death. The leech's body, which is composed of a significant amount of water, cannot withstand this rapid loss of moisture.