Reactions in our natural world range from classical chemical reactions to nuclear reactions.
A classical chemical reaction is a natural process that occur when one or more elements called reactants change to form one or more products.
Chemical reactions can be speed up by the action of enzymes, which are biological catalysts capable of lowering the activation energy of the reactions.
On the other hand, nuclear reactions occur when atoms react among them to generate new elements.
Nuclear reactions can be classified into fusion reactions where atomic nuclei fuse and fusion reactions where an atomic nucleus gives rise to two different atoms.
In conclusion, Reactions in our natural world range from classical chemical reactions to nuclear reactions.
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