C6H12O6+6O2--->6CO2+6H2O+energy
Oxygen(O2) is used to break down glucose(C6H12O6) into energy so the answer is b
I believe Biotic factors is the term for living organisms & Abiotic factors is the term for Non- living factors such as water , air , temperature & soil .
when an organism has Aa genotype for a particular trait, during segregation each gamete should contains one A and one a allele for proper segregation.