In which of the following is countercurrent heat exchange not known to occur?
A) porpoise fluke
B) beaver tail
C) bird legs
D) primate hands
D
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Four of the five animals listed below possess the
same type of skeleton. Select the exception. a. beetle b. snake c. bird d. human e. frog
The geographical distribution of organisms makes sense only in the context of:
a. natural selection. b. plate tectonics. c. continental drift. d. evolution. e. ecology.
How do planarians survive without a circulatory system? What will be an ideal response?
Which of the following is not one of the stages of HIV infection?
A. flat or raised lesions on the penis or vulva B. opportunistic infections C. a CD4 + T cell count between 200 and 499 per microliter of blood D. a greater than 500 CD4 + T cells per microliter of blood E. a CD4 + T cell count below 200 per microliter of blood