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.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
Skin color variations
Electrophoresis Question
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economic question
A human pedigree of the X-linked color-blindness trait
