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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.
People about to have surgery must tell their health care providers about all supplements they take.
Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.