The Sulphur Bacteria which obtain energy by oxidizing H2S instead of water is called:

Explanation

The correct answer is Gamma proteobacteria. This group includes chemolithotrophic sulfur bacteria, which are capable of oxidizing H2S to obtain energy. This oxidation process releases energy that the bacteria utilize for growth and reproduction. These bacteria play a crucial role in the environment by participating in the sulfur cycle and have potential applications in biotechnology.In contrast, Alpha proteobacteria and Beta proteobacteria typically use organic compounds for energy, and Delta proteobacteria are more commonly associated with sulfur compound reduction rather than oxidation.