The term describes fly species which exploit foods and habitats created by agriculture and other human activities

Synathropic  is  the  term  which  is  used  to   describe  fly  species  which  exploit  foods and habitat  created  by  agriculture  and other  human  activities. They   are  considered as pest   and  also as  vectors  to  diseases which   live  near  human and  benefit from   human and their  dwelling.

organic compounds are broken down in the absence of oxygen

Explanation

for example alcoholic fermentation done by Saccharomyces Cerevisae

C6H12O6-->2CO2+2C2H5OH