Which of the following is NOT a factor that contributes to healthcare-associated infections?
A) compromised host
B) chain of transmission in the hospital
C) normal microbiota on the patient
D) microorganisms in the hospital environment
Answer: C) normal microbiota on the patient
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Examine the flux diagrams in Figure 25.6 to address the following questions. What is the difference in the rate of carbon exchange (in gigatons per year of carbon) between photosynthesis and respiration in the terrestrial environment?
What will be an ideal response?
World human population in 2009 was approximately
A. 670 million. B. 1.8 billion. C. 4.6 billion. D. 6.7 billion. E. 10 billion.
In Connell's experiments with the barnacles Chthamalus stellatus and Semibalanus balanoides, the potential distribution of each species, in the absence of the other, is known as the
A. competition zone. B. idealized niche. C. fundamental niche. D. tidal boundary. E. realized niche
Once the initial case has occurred, Legionnaires' disease spreads as a propagated epidemic.
Answer the following statement true (T) or false (F)