Animals that participate in the life cycles of pathogens and transmit pathogens from host to host are ________.
A. aerosols
B. mechanical vectors
C. fomites
D. biological vectors
E. droplet nuclei
Answer: D
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__________ occurs when two species act as agents of selection upon one another. Fill in the blank(s) with the appropriate word(s)
Which of the following descriptions of Mendel is
INCORRECT? a. He was simply lucky to work out the laws of genetics. b. He focused on contrasting phenotypic characteristics. c. He demonstrated that the blending theory of inheritance was wrong. d. He kept exact mathematical data and was one of the first scientists to analyze results numerically. e. He was a monk, a science teacher, and a plant breeder.
A certain species of butterfly varies in color from white to dark blue. The birds found in the same area feed on the white or lightly colored butterflies, leaving butterflies that are darkly colored. This is an example of what type of selection?
A. directional selection B. stabilizing selection C. disruptive selection D. artificial selection
A patient that experiences a tuberculin skin test reaction is experiencing which class of hypersensitivity reactions?
A) type I B) type II C) type III D) type IV E) type V