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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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The horizontal fraction bar was introduced by the Arabs.

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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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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

Child influences on parents, parenting influences on children, and influences of the marital ... Child influences on parents, parenting influences on children, and influences of the marital ...
Harlem’s Promise Academy has a record of graduating and sending to college more than 90 percent ... Harlem’s Promise Academy has a record of graduating and sending to college more than 90 percent ...
Structural MRIs reveal thinning of sensorimotor cortex in children with Tourette syndrome. Red and ... Structural MRIs reveal thinning of sensorimotor cortex in children with Tourette syndrome. Red and ...
Blood pressure cuffs are available in various types and sizes for infants and children Blood pressure cuffs are available in various types and sizes for infants and children
Children's behaviour rating scores on measures of aggression and anxiety Children's behaviour rating scores on measures of aggression and anxiety
Days 18–23 Bumps of mesoderm (somites) form. They will develop into the dermis and most of the ... Days 18–23 Bumps of mesoderm (somites) form. They will develop into the dermis and most of the ...
Video: Brain Anatomy Animation (Part 1 of 2)

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