if every experiment has its variables, does there have to be an independent variable?

yes, there has to be an independent variable that has to be in control.

does there only have to be one variable that is tested?

yes, because you have to know if the affect is working.

what are heterotrophs?

organisms that consume other organisms.

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Science

Science Game Created

Question	Answer
if every experiment has its variables, does there have to be an independent variable?	yes, there has to be an independent variable that has to be in control.
what has to be tested or measured in an experiment?	dependent variables.
what is an in-control variable used for?	used to be measured against.
does there only have to be one variable that is tested?	yes, because you have to know if the affect is working.
what are heterotrophs?	organisms that consume other organisms.