Help!!i need someone to answer the “how it develops the analogy”

a constant variable, normally called a controlled variable, is the term for a variable that remains constant throughout an experiment, though other variables may change. an example is the water pressure for a faucet when measuring the amount of water released when the faucet is opened to various increments.

you did not give us a excerpt to read or any statements to choose from so we can not know the right answer be more detailed when asking your question