Since you didn't tell us the choices, I can pick anything I like.
The one that always does it for me is " foaming brine " .
Answer: Dependent Variable
Explanation:
There are two types of variable in any kind of experiment:
Independent Variable which are mostly known as inputs
Dependent Variables which are mostly known as outputs
In any experiment, the researches focus on observing the output values (dependent variables) by intentionally changing the inputs (Independent variables).
e.g. If we are observing the strain on any object, we try to change the value of stress on that particular object.
Here strain is a dependent variable whereas stress is an independent variable because it doesn't depend on whatever the value of strain may be.
Explanation:
An element contains just one type of atom. A compound contains two or more different atoms joined together. A mixture contains two or more different substances that are only physically joined together, not chemically. A mixture can contain both elements and compounds.
