Which best describes chemosynthesis?

Chemosynthesis is best described as a method used by certain organisms to convert chemicals into food. This process occurs in environments where sunlight is absent or minimal, such as deep-sea hydrothermal vents. Unlike photosynthesis, which relies on sunlight to synthesize food from carbon dioxide and water, organisms that utilize chemosynthesis, like certain bacteria, gain energy from chemical reactions, often involving hydrogen sulfide or methane. This ability allows them to produce organic compounds that serve as an energy source for themselves and for other organisms in the ecosystem. In essence, chemosynthesis plays a crucial role in nutrient cycling and energy transfer in ecosystems where sunlight cannot reach.