The most common mode of HAV transmission is
A) contamination of food during preparation.
B) contamination of food before it reaches a food service establishment.
C) blood transfusion.
D) contaminated hypodermic needles.
E) airborne.
A
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Different courtship displays among closely related bird species are an example of:
1.Temporal Isolation 2.Mechanical Isolation 3.Ecological Isolation 4.Behavioral Isolation
Individual species will continually evolve as a result of:
a. coevolution. b. convergent evolution. c. punctuated equilibrium. d. natural selection. e. gradualism.
What evolutionary advantage is provided by sexual reproduction?
a. increased genetic diversity b. making clones c. production of genetically identical offspring d. making polyploidy possible e. removal of all genetic mutations
The growth rate of a population is expressed as:
a. b ? d. b. i ? e. c. K ? N. d. dN / r. e. (K ? N) / K.