Q: Answer the following question given this paragraph: Chemoautotrophs are cells that break down inorganic molecules to supply energy for the cell, and use carbon dioxide as a carbon source. Chemoautotrophs include prokaryotes that break down hydrogen sulfide (H 2 S the "rotten egg" smelling gas), and ammonia (NH 4 ). Nitrosomonas , a species of soil bacterium, oxidizes NH 4 + to nitrite (NO 2 - ). This reaction releases energy that the bacteria use. Many chemoautotrophs also live in extreme environments such as deep sea vents. Q: What are the cells that break down inorganic molecules to supply energy for the cell, and use carbon dioxide as a carbon source? A:

Options:
(I). staurikosaurus.
(II). fluctuations.
(III). Sediments.
(IV). chemoautotrophs.
The answer is:
(IV).