Help guys, I don't wanna start over please don't get it wrong

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a control group

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The control group is composed of participants who do not receive the experimental treatment. When conducting an experiment, these people are randomly assigned to be in this group. They also closely resemble the participants who are in the experimental group or the individuals who receive the treatment.  

  An experimental group (sometimes called a treatment group) is a group that receives a treatment in an experiment. The “group” is made up of test subjects (people, animals, plants, cells etc.) and the “treatment” is the variable you are studying.

so because the glasses received no salt this would be your base sodium level which creates a control for added salt as well as the effects of salt.

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 //)/    hope this helps -Tom   \(\\

/'"^"                                           "^"`\

I would like brainliest if I deserve it plz

not sure how to answer your question sorry