Carbohydrate is the answer
A Polypeptide chain is a sequence of amino acids that is the foundation for the basic structure of a protein
The bonds that hold H2O2 together break apart and the atoms are rearranged to form water (H2O) and oxygen (O2) molecules. This happens slowly in store-‐bought hydrogen peroxide, so even in dark bottles, it will 'expire' in a year, or less if it's opened. ... And higher concentrations of H2O2 produce more oxygen.
The more the people, the more pollutant they generate which will pollute the the water.
Use carbon dioxide and release oxygen gas