The Kruskal-Wallis test is to be used to determine whether there is a significant difference (alpha = 0.05) between the three groups using the following data: 
For this test,how many degrees of freedom should be used?
Definitions:
Crenation
The shrinking of cells in a hypertonic solution due to loss of water through osmosis.
Osmotic Pressure
The pressure that needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane.
Turgor Pressure
The pressure exerted by water inside the cell against the cell wall, contributing to the structural rigidity of plant cells.
Cell Metabolism
The complex set of life-sustaining chemical reactions in cells that allows organisms to grow, reproduce, maintain structures, and respond to environments.
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