Scientists use diagrams called to trace the flow of energy through the ecosystems.

Ok so in this experiment what we want to find is the catalyst for the reaction. Our original reaction is the following. A + B --> C, therefore to find which of the unknown substances (X, Y, and Z) is the catalyst reaction we simply have to do the following:

A + B + X --> C

A + B + Y --> C

A + B + Z --> C

The reaction that produces C much faster than our original reaction A + B --> C will be our catalyst. The reason being that one of the substances will increase the rate of the chemical reaction.

I hope it helps, Regards.