Respuesta :

Answer:

C. and D.

Explanation:

As the problem states, a solution containing bromothymol blue would turn from blue into yellow whenever CO₂ gas is added to it.

  • When a person exhales, their breath contains CO₂. Thus blowing air into the solution through a straw would add CO₂ to the solution
  • Yeast cells react with sugar and water and produce alcohol, CO₂ and energy; thus turning the solution yellow.
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