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The human body produces and destroys 15 million blood cells every second.
Aspirin may benefit 11 different cancers, including those of the colon, pancreas, lungs, prostate, breasts, and leukemia.
Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.
HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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.
![Variation in climatic conditions result in geographic variation in the distribution of biome types a](https://biology-forums.com/gallery/47/medium_33_27_08_11_11_56_24_15442181.jpeg)
![Examples of four different types of cells from the body. Although each cell has a cell membrane, nuc](https://biology-forums.com/gallery/47/medium_14755_16_09_12_5_52_12_8537838.jpeg)