Nutrition

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Across
  1. 3. a reactant in photosynthesis
  2. 4. one of the component of lipid
  3. 6. something present in the environment in short supply that slows down a reaction
Down
  1. 1. a wave-like contraction moving food in the oesophagus
  2. 2. an enzyme that has a low optimum pH
  3. 5. an enzyme produced in the salivary gland