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Author Question: You repeatedly pair a tone with food until a dog salivates to the sound of the tone. You then ... (Read 84 times) |
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.