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The graphs are showing the difference in exo/endothermic reactions.

Explanation:

In an exothermic reaction, the reactants are higher than the products. There are more reactants and less products. This is the opposite of an endothermic reaction. In endothermic reaction, the reactants are lower than the products as shown in the graph. The activation energy looks about the same.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.