Annette observed that if she put salad dressing on her salad in the morning before leaving home, by lunch time she found excess liquid in her container and the greens were wilted. why does this happen?

Osmosis is the short answer 

what is happening is that the salad dressing has a lot of salts and little water and the lettuce leaves have all the water so when the letters has salad dressing on it the water is drawn out of the lettuce leaves and ended up in the bottom of the bowl 

Nerves are problay the number 1 thing in the body