Only when there is no product that is when a chemical reaction has not occured
Predator 1: wolves
Predator 2: foxes
Prey 1: bison
Prey 2: prairie dogs
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Always. You never know what kind of chemical you’re dealing with and how powerful it is.
Through pH scale. it measures the acidity of a substance, pH is measured with a litmus paper, if the paper turns red then it is acidic.
