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Mutualisms, such as those that occur among plants and pollinators, generally involve large numbers o
Renal calculi (stones) can form in several areas within the urinary tract. When they form in the kid
Cerebral angiography. The four angiograms each reveal the distribution of blood vessels supplying th
Angioplasty. One form is called balloon angioplasty, shown here. A balloon catheter is threaded into
Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
Flexible exchange rates are supposed to prevent long-term trade deficits.