Trapped sebum can stagnate and dry out, becoming darkened. This is called a _______

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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People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.

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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

Some male birds and mammals congregate in communal courting grounds called leks.

Electrocardiography. (a) Electrodes are placed on the patient’s chest to record the electrical event

In this painting evangelist George Whitefield appears to be cross-eyed. This is no fault of John Wol

A resonance tube, called a Helmholtz resonator, is used on the intake duct between the air filter ...

The nucleus is bounded by a double membrane called the nuclear envelope

A lesion called a plaque in the brain of an individual with Alzheimer disease. A ring of degeneratin

Author Question: Trapped sebum can stagnate and dry out, becoming darkened. This is called a ________. (Read 18 times)

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