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Author Question: 5% of students at a university attended a lecture. If 6000 students are enrolled at the university, ... (Read 171 times) |
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
In 1864, the first barbiturate (barbituric acid) was synthesized.