|
Author Question: Methane has ________ covalent bonds and ________ lone pairs. A) 4; 2 B) 4; 1 C) 4; 0 D) 2; ... (Read 36 times) |
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.
Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.