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Which component of urine (“fake”) may have the greatest effect on the…

- - - - The time taken
  - - - why do we need controlled variables well?
        
        if temperature is higher or lower than normal it may cause the hydrogel unable to work and may cause the water evaporate and make the error in the experiment.
    - - why do we need controlled variables well?
        
        The different humidity in the environment may cause the same experiment spend very different time for hydrogel to condense water/urea/glucose/water/NaCl
    - - why do we need controlled variables well?
        
        directly sunlight may cause the temperature rise and may cause independent variables such as water evaporate or hydrogel unable to work and cause error.
    - - why do we need controlled variables well?
        
        Higher or lower PH level may cause the hydrogel unable to work
  - - - in this case will be1L
    - - in this case will be 9g
    - - in this case will be 3.5g
    - - in this case will be1g
- - - - wash the allergy part quickly and Lay the person flat – do not allow them to stand or walk. Give adrenaline injector (such as EpiPen® or Anapen®) into the outer mid-thigh. Phone an ambulance if necessary – call triple zero (000).
  - - - clean the glasses pieces immediately and tell the teacher to warn classmates away
  - - - try to vomit out, If you can't phone an ambulance if necessary