What form of stimulus will cause the blood
vessels of the skin to relax and increase in
diameter?
a. decrease in temperature
b. increase in temperature
c. electrical stimulus
d. mechanical stimulus
e. more than one of these
B
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What process refers to dramatic phenotypic changes that sometimes occur in evolution, such as the
appearance of feathered wings during the evolution of birds? a. paedomorphosis b. gradualism c. macroevolution d. allopolyploidy e. microevolution
A commercially significant human protein now produced in bacteria is
A. gamma globulins. B. AZT. C. human insulin. D. HIV vaccine. E. hemoglobin.
Conducting tubes of phloem consist of stacks of ____.
A. dead sieve elements B. living sieve elements C. dead vessel elements D. living vessel elements E. dead companion cells
The inner layer of the skin, the dermis, is mostly:
A) connective tissue. B) nervous tissue. C) muscle tissue. D) keratin. E) epithelial tissue.