|
|
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.
An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.
![The tiger, Panthera tigris, was historically found throughout much of Asia, but at low population de](https://biology-forums.com/gallery/47/medium_33_22_09_11_9_37_27_18051031.jpeg)
![A recent study found that female baboons that groom each other are more likely to come to each other](https://biology-forums.com/gallery/47/medium_12359_20_04_12_11_58_37.jpeg)