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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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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.

The functions of species richness. The functions of species richness.
Invasive species in Canada include (a) zebra mussels, Dreissena polymorpha, (b) sea lamprey, Petromy Invasive species in Canada include (a) zebra mussels, Dreissena polymorpha, (b) sea lamprey, Petromy
Primary visual processing areas (blue) in (a) human (lateral and mesial views) and (b) chimpanzee. Primary visual processing areas (blue) in (a) human (lateral and mesial views) and (b) chimpanzee.
A phylogenetic tree showing that all non-African human populations share a closer genetic relationsh A phylogenetic tree showing that all non-African human populations share a closer genetic relationsh
Human urinary system. Human urinary system.
Human Thyroid and Parathyroid Glands Human Thyroid and Parathyroid Glands
Video: Hydrogen bonds - role in the body

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