Class 5 the percentage of dash is the most in the air of oxygen option to nitrogen option 3 carbon dioxide​ give soon please

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.

the question isn't complete here so i can't right an answer '_'

the correct answer in apex is tissue development, i know because i just had this question