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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

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The average adult has about 21 square feet of skin.

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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.

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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

Evolutionary adaptation to a new environment via natural selection. Evolutionary adaptation to a new environment via natural selection.
Traditional animal phylogeny based on body plans. Traditional animal phylogeny based on body plans.
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Emotional Knowledge Across Cultures Emotional Knowledge Across Cultures
Human impacts and the built environment Human impacts and the built environment
Selective pressures from the environment influence adaptation Selective pressures from the environment influence adaptation
Video: Proteins Defined, Hierarchy & Composition of Cells

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