Independent (Manipulated) Variable The Independent Variable is is the thing
tasted.

A manipulated variable is the independent variable in an experiment. It's called “manipulated” because it's the one you can change. ... The manipulated or independent variable is the one that you control. The controlled variable is the one that you keep constant.

Explanation:

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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