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Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
Stay positive
Nonverbal communications convey strong, powerful messages that may be negative or positive.
The bacterial cell wall: (a) gram-positive bacterium; (b) gram-negative bacterium.
Cancer cells can move to new locations in the body, a process called metastasis
A lesion called a plaque in the brain of an individual with Alzheimer disease. A ring of degeneratin