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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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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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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.

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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

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In women, pharmacodynamic differences include increased sensitivity to (and increased effectiveness of) beta-blockers, opioids, selective serotonin reuptake inhibitors, and typical antipsychotics.

A specific human chromosomal landscape A specific human chromosomal landscape
Type II Tissue Specific Reactions Type II Tissue Specific Reactions
Vertical filing systems offer an alternative to traditional upright storage systems Vertical filing systems offer an alternative to traditional upright storage systems
Measuring the Specific Gravity of Urine with a Refractometer Measuring the Specific Gravity of Urine with a Refractometer
Organ-Specific Toxicity Organ-Specific Toxicity
Specific Gravity of Selected Materials Specific Gravity of Selected Materials
Video: Neuron structure and function - sensory neurons, association neurons & motor neurons

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