Which of the following is the major focus of epidemiologists?
A. Measuring the level of resistance to antimicrobial agents
B. The development of methods for disease prevention
C. The discovery of factors essential to disease occurrence
D. Both the discovery of factors essential to disease occurrence and the development of methods for disease prevention
E. Both the discovery of factors essential to disease occurrence and measuring the level of resistance to antimicrobial agents
F. Both the development of methods for disease prevention and measuring the level of resistance to antimicrobial agents
Answer: D
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Earthworms and slugs move by
A) contracting their cilia. B) contracting extensor and flexor muscles attached to their endoskeleton. C) alternating contractions of longitudinal and circular muscles. D) stretching their longitudinal muscles and contracting their circular muscles.
Which bacterial structures are important for adherence to surfaces?
A. endospores B. cell walls C. fimbriae D. capsules E. flagella
What is the probability of two parents with the genotypes Pp and pp, producing an offspring with the genotype of PP?
A. 100% B. 50% C. 75% D. 0 E. 25%
The evolution of saber teeth in a both extinct carnivorous mammals and marsupials is an example of
A. homology caused by common descent. B. homology caused by convergence. C. homoplasy caused by common descent. D. homoplasy caused by convergence. E. homoplasy caused by evolutionary reversal.