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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

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The longest a person has survived after a heart transplant is 24 years.

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There are more bacteria in your mouth than there are people in the world.

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The effects of organophosphate poisoning are referred to by using the abbreviations “SLUD” or “SLUDGE,” It stands for: salivation, lacrimation, urination, defecation, GI upset, and emesis.

Extinction and immigration of bird species on the California Channel Islands between 1917 and 1968 ( Extinction and immigration of bird species on the California Channel Islands between 1917 and 1968 (
The Dugong is an endangered species; the largest remaining population is found in Australian waters The Dugong is an endangered species; the largest remaining population is found in Australian waters
Diagram of Human Skeleton Diagram of Human Skeleton
A colorized image of the human male chromosome set A colorized image of the human male chromosome set
Cross-section of a human molar Cross-section of a human molar
Cladogram showing genetic distances and relationships between human populations Cladogram showing genetic distances and relationships between human populations
Video: Type of Cell Junctions - Desmosome, Hemidesmosomes and Gap Junctions

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