Final answer:
A chemoautotroph uses chemical compounds for energy and inorganic sources for carbon.
Step-by-step explanation:
The correct answer is chemoautotroph.
A chemoautotroph is an organism that uses chemical compounds for energy and inorganic sources for carbon. These organisms obtain energy through a process called chemosynthesis. They include some bacteria and archaea.
On the other hand, photoautotrophs use light energy and carbon dioxide as their carbon source. Examples of photoautotrophs are plants, algae, and some bacteria.
Chemoheterotrophs get both their energy and carbon source from organic compounds. Most eukaryotes, including humans, fall under this category as they rely on consuming organic molecules for energy.
Finally, photoheterotrophs capture light energy but obtain carbon from organic sources. Examples are purple non-sulfur bacteria, green non-sulfur bacteria, and heliobacteria.