Answer: Chemoautotrophs.
Step-by-step explanation:
Chemoautotrophs obtain energy by oxidizing inorganic substances to produce ATP (adenosine triphosphate) through chemical reactions. They use this energy, in part, to fix carbon dioxide and synthesize organic molecules. Examples of chemoautotrophs include certain bacteria and archaea that thrive in environments such as deep-sea hydrothermal vents or sulfur-rich habitats. These organisms do not rely on sunlight for energy like photoautotrophs, but instead derive their energy from chemical reactions involving inorganic compounds.