The inside part or region of something...
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The area in the thorax between the two lungs, .where the heart, .esophagus, .aorta, .bronchials, .and thymus are located....
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The corner of the eye by the nose...
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The collection of semen for the purpose of breeding...
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The phase in the division of cells where the chromosomes are arranged in a plane...
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A kidney that resembles an embryo...
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The processes in which an organism changes from one form to another, .like an insect does...
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The chemical changes that occur inside the living cells of plants and animals...
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The various parasites and bacteria that grow at body temperature...
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The middle part of the embryo...
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The part of the tooth surface that is closest to the middle...
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The part of the peritoneum that holds the parts of the intestines inside the abdomen...
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