Organisms require energy to carry out metabolic activities, and prokaryote species occur in all nutrition-obtaining categories.Organisms classified as _______ obtain their energy by oxidizing inorganic substances such as ammonia, nitrate, hydrogen sulfide, and sulfur.

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Organisms that obtain their energy by oxidizing inorganic substances are called chemoautotrophs. They do not require sunlight to carry out metabolic activities and can synthesize their own organic compounds from CO2. This process is known as chemosynthesis.

Organisms Require Energy to Carry Out Metabolic Activities, and Prokaryote