chemoautotrophs
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Organisms that obtain energy directly from inorganic molecules are known as chemotrophs. These organisms use chemical reactions to derive energy for their metabolic processes, instead of relying on sunlight like phototrophs. Examples include certain bacteria and archaea living in deep-sea hydrothermal vents or in soil.
An autotroph is an organism that can produce its own food through photosynthesis or chemosynthesis. This means they can convert sunlight or inorganic compounds into organic molecules that serve as nutrients for the organism.
An organism that uses energy to produce its own food supply from inorganic compounds is called an autotroph (within a food chain, it is a producer).
Decomposer
The Calvin Cycle is the correct answer.
A chemosynthetic organism is an organism that obtains energy by converting inorganic molecules such as hydrogen sulfide or methane into organic matter through the process of chemosynthesis. These organisms are commonly found in environments devoid of sunlight, such as deep-sea hydrothermal vents or cold seeps. Examples of chemosynthetic organisms include bacteria and archaea.