The open, sunlit surface area of a lake away from the shore is in which zone?
A. benthic
B. littoral
C. bathyal
D. limnetic
E. profundal
Answer: D
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What kind of new nuclear reactor design will alleviate some of the safety issues of older designs?
What will be an ideal response?
The only zone of the ocean with sufficient light for photosynthesis is the ________.
A. disphotic zone B. euphotic zone C. aphotic zone D. None of these is correct. E. All of these are correct.
Which of the following is true of peptidergic messengers?
A) None act directly, they all require a secondary messenger. B) They all utilize G-protein-adenylate cyclase in a second messenger system. C) They all use derivatives of phosphatidylinositol in a second messenger system. D) None of the above is true.
Birthrate is which of the following?
a. Number of births per family. b. Number of births per man. c. Number of births per couple. d. Number of births per woman.