What is the role of saliva in the digestion of food?

  • A
    It helps in the mechanical breakdown of food.
  • B
    It contains enzymes that break down proteins.
  • C
    It moistens food and contains salivary amylase to break down starch into sugar.
  • D
    It kills all bacteria present in the food.

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Choose the event that does not occur in photosynthesis.

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