A bacterium is found that can photosynthesize in the presence of light but uses hydrogen sulfide and releases elemental sulfur as a bi-product.This organism can best be classified as a

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The organism is capable of photosynthesis in the presence of light, which means it uses light energy to synthesize organic compounds from carbon dioxide. It is also an autotroph, meaning it can produce its own organic compounds. The fact that it uses hydrogen sulfide as a source of electrons and releases elemental sulfur as a byproduct indicates that it is a photoautotroph that uses a type of photosynthesis called "anoxygenic photosynthesis". This type of photosynthesis is used by some bacteria that evolved before the appearance of oxygen in Earth's atmosphere.

A Bacterium Is Found That Can Photosynthesize in the Presence