Q. Assertion : Metabolism refers to the sum of chemical reactions that occur within living organisms.
Reason : Metabolic reactions occur simultaneously inside living organisms.

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Solution:

All living organisms are made of chemicals. These chemicals, small and big, belonging to various classes, sizes, functions, etc., are constantly being made and changed into some other biomolecules. These conversions are chemical reactions or metabolic reactions. There are thousands of metabolic reactions occurring simultaneously inside all living organisms, be they unicellular or multicellular.