What is quimiosintesis?

Chemosynthesis is a process by which some organotrophic bacteria, including certain archaea, use chemical energy to produce carbohydrates. This process occurs in the absence of sunlight and is dependent on certain oxidizing or reducing agents, such as sulfur compounds, hydrogen gas, or methane. Chemosynthesis supports bacterial life in ecosystems not exposed to sunlight, such as deep-sea hydrothermal vents and some subsurface environments. The process of chemosynthesis is similar to photosynthesis in that carbohydrates are produced, but different in that chemical energy is harvested from inorganic sources rather than light energy from the sun.