Time-Domain Representation Signals are represented as sequences of numbers, called samples Sample value of a typical signal or sequence denoted as x[n] with n being an integer in the range x[n] defined only for integer values of n and undefined for non-integer values of n

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solar energy as the driving force for this global process (Fig. 1). All living organisms also require a source of nitro￾gen, which is necessary for the synthesis of amino acids, nucleotides, and other compounds. Plants can generally use either ammonia or nitrate as their sole source of ni￾trogen, but vertebrates must obtain nitrogen in the form

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