Physiologically important ions are called trace elements.

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

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More than 4.4billion prescriptions were dispensed within the United States in 2016.

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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.

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According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.

Bay (left) and chestnut (sometimes called "sorrel") are two of the most common coat colors

Formed elements of blood: erythrocytes, leukocytes (neutrophils, eosinophils, basophils, lymphocytes

Dominance relationships among individuals play an important role in many primate societies.

Using trace elements in carbonate shells to estimate temperature

Core-promoter elements found in focused promoters

A commercially available DNA microarray, called a GeneChip, marketed by Affymetrix, Inc

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