When a physical barrier separates a population, leading to the evolution of new species on either side of the barrier,
____ has occurred.
a. sympatric speciation
b. allopatric speciation
c. directional selection
d. ecological isolation
e. behavioral isolation
ANSWER: b
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a. Macrophages b. Helper B cells c. Mast cells d. Cytotoxic T cells e. Helper T cells
Which of the following elements is considered an essential micronutrient for plants?
a. phosphorus b. silver c. molybdenum d. carbon e. lead
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A) inactivated whole-agent vaccine. B) attenuated whole-agent vaccine. C) conjugated vaccine. D) subunit vaccine. E) toxoid vaccine.
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Answer the following statement true (T) or false (F)