Find at least 3 different organisms (yeast cannot be on of the 3) that produce ATP without the use of oxygen. Search the WWW (and the online scientific literature available) to find information on this phenomenon and write paragraph for each (200-250) words in total, you should address these following points:

1) What is the name of the organisms and what general kind of organisms is it?

2) What is the environment that the organisms lives in, and for what reason(s) is that environment devoid of oxygen?

3) By what mechanism does each organism generate ATP? 

Please write the sources that you get the information from.