This arthropod is the vector for Lyme disease
a. spider
b. tick
c. wasp
d. mosquito
e. mites
ANSWER: b
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Which is an example of a specific line of defense against an infectious agent?
A) The skin acts as a barrier to infection by the agent. B) Macrophages engulf the invading agent in the affected tissue. C) Mucus membranes in the lungs trap the invading pathogens. D) B cells stick to the invading pathogen's surface.
Abrupt genetic changes that quickly lead to the reproductive isolation of a group of individuals is
likely to lead to
a. sympatric speciation. b. allopatric speciation. c. extinction. d. mutation. e. anagenesis.
A wormlike arthropod with a flattened body
and carnivorous eating habits would be identified as a a. crustacean. b. millipede. c. spider. d. trilobite. e. centipede
Variation within a population is maintained by
A. genetic recombination due to fertilization. B. mutation. C. gene flow. D. All of the choices are correct.