In scientific terminology, what is a control, and what is a variable???

I need help with my science fair project, have any websites I could refer to??In scientific terminology, what is a control, and what is a variable???
A variable is a characteristic or condition that changes or has different values for different individuals.





A control is to verify or regulate (a scientific experiment) by conducting a parallel experiment or by comparing with another standard.In scientific terminology, what is a control, and what is a variable???
A Control group is the experimental group with the ';normal circumstances'; for whatever variable you are changing. A variable is what you change to do the experiment. For example, if you are testing what kind of dirt a certain plant grows best in, the kind of dirt and height of the plant are the variables. The height of the plant DEPENDS ON the kind of dirt. The height of the plant is called a DEPENDENT VARIABLE, and the kind of dirt is called an INDEPENDENT VARIABLE. You can use the ';X'; axis (across the bottom of a chart) to put the kinds of dirt, and the ';Y'; axis (up the side of the chart) to put the height the plants grow to.
A variable is any measured characteristic or attribute that differs for different subjects. For example, if the weight of 30 subjects were measured, then weight would be a variable





In the control experiment all factors, apart from the one under test, are exactly the same as in the test experiments, and all the same measurements are carried out





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