T-cells are a type of white blood cell that circulate around our bodies, scanning for cellular abnormalities and infections.
by experimenting the layers of the earth
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the sperm fertilizing the egg
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incoming Paleoindians, the first Americans, who allegedly hunted them to extinction.
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Major organs involved in the digestive system include the mouth, stomach, small intestine, large ... When it reaches your stomach, a sphincter opens and dumps the food in. ... To move into the small intestine, chyme must pass through the pyloric sphincter. From here it enters the duodenum, the first part of the small intestine.
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