Students investigate how onion cells react to salt (NaCl) solutions of different concentrations. They observe onion cells in three salt solutions under a microscope. The image of an onion cell in a 3% salt solution is shown.
Onion Cell in 3% Salt Solution

Less than 3%

Explanation:

I'm guessing that since the solution has a concentration of less than 3%, the water would go into the cell to maintain which would make it expand.

1. glaciers are melting

2. more water going into ocean (water's such as fresh waters, etc)

compost can be added to topsoil as a:

pesticide