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Author Question: During aerobic respiration, H2O is formed. Where does the oxygen atom for the fo (Read 780 times) |
During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.