A popular science demonstration is to take several liquids that will not mix together and "stack" these liquids in a tall glass cylinder. Suppose the following three liquids were placed in the same tall, narrow glass cylinder: 
The substance that should be placed first in the cylinder so that it is on the bottom is ________.
Definitions:
Compliance
The act of adhering to and following laws, regulations, standards, and ethical practices set by regulatory bodies or institutions.
Price Changes
Variations in the cost of goods or services over time, influenced by factors such as supply and demand, inflation, and market competition.
Implied Contract
A contract formed in whole or in part from the conduct of the parties (as opposed to an express contract).
Enforce In Court
The act of seeking judicial action to ensure compliance or to execute a legal right, often involving litigation.
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