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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

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Critical care patients are twice as likely to receive the wrong medication. Of these errors, 20% are life-threatening, and 42% require additional life-sustaining treatments.

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Approximately 500,000 babies are born each year in the United States to teenage mothers.

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Individuals are never “cured” of addictions. Instead, they learn how to manage their disease to lead healthy, balanced lives.

(a) Mammal species from central Saskatchewan differ greatly in their isotopic signatures. (b) There (a) Mammal species from central Saskatchewan differ greatly in their isotopic signatures. (b) There
Distributions of two barnacle species within the intertidal zone Distributions of two barnacle species within the intertidal zone
Recently discovered species Tersicoccus phoenici under microscope Recently discovered species Tersicoccus phoenici under microscope
Fossil remains of anatomically modern humans from the Czech Republic and from China (center crania) Fossil remains of anatomically modern humans from the Czech Republic and from China (center crania)
Species-area curves Species-area curves
Ant species richness by latitude. Ant species richness by latitude.
Video: Spermatogenesis Animation

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