In absence of oxygen and in lack oxygen (in glucose breakdown pathway) how the energy produced is 2 ATP even though both have different oxygen level?

In absence of oxygen and in lack oxygen (in glucose breakdown pathway)

1.	In absence of oxygen and in lack oxygen (in glucose breakdown pathway) how the energy produced is 2 ATP even though both have different oxygen level?
Answer» In absence of oxygen and in lack oxygen (in glucose breakdown pathway) how the energy produced is 2 ATP even though both have different oxygen level?