Final answer:
Anaerobic bacteria will dominate a natural body of water that lacks dissolved oxygen.
Step-by-step explanation:
True. Anaerobic bacteria will dominate a natural body of water that lacks dissolved oxygen. These bacteria are specialized organisms that can survive and grow in environments without oxygen. Some examples of anaerobic bacteria include obligate anaerobes, which cannot survive in the presence of oxygen, and facultative anaerobes, which can switch between aerobic respiration and fermentation depending on the availability of oxygen.