Among the following respiratory substrates,which one is the main source of energy?

  • A
    Organic acids
  • B
    Proteins
  • C
    Fats
  • D
    Carbohydrates

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Respiration is an energy-releasing and enzymatically controlled catabolic process which involves a step-wise oxidative breakdown of organic substances inside living cells. In this statement about respiration,explain the meaning of $(a)$ Step-wise oxidative breakdown $(b)$ Organic substances (used as substrates).

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