What does autotrophic bacteria release into the air?

Autotrophic bacteria, particularly those that perform photosynthesis, release oxygen into the air as a byproduct of their metabolic processes. During photosynthesis, they convert carbon dioxide and water into glucose and oxygen, contributing to the oxygen content of the atmosphere. Additionally, some autotrophic bacteria, such as those involved in nitrogen fixation, may release nitrogen gas, which plays a crucial role in the nitrogen cycle.