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The average adult has about 21 square feet of skin.
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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
![C:N ratios differ a great deal among the tissues of pines and between the woody tissues of pines and](https://biology-forums.com/gallery/47/medium_33_09_09_11_10_11_48_17012005.jpeg)
![An electrocardiogram (EKG) wave, a record of the electrical signal as it moves through the conductio](https://biology-forums.com/gallery/47/medium_14755_10_09_12_7_22_09_85211006.jpeg)