The osmoregulatory and ionoregulatory problems facing a freshwater fish are
A. loss of water and loss of ions.
B. loss of water and gain of ions.
C. gain of water and loss of ions.
D. gain of water and gain of ions.
E. loss of urine and gain of ions.
C. gain of water and loss of ions.
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Imagine that several thousand years ago, a group of bats and a group of frogs colonized an island at the same time. What can you expect of their current descendants?
A. There will be more frog species compared to bat species. B. There will be more bat species compared to frog species. C. The number of bat and frog species will be equal. D. All frog species will have become extinct on the island. E. All bat species will have become extinct on the island.
Which area, A, B, C, or D, represents the area of a boreal forest biome?
1.A
2.B
3.C
4.D
The greatest number of pathogens enter the body through the ________.
A. skin B. respiratory system C. gastrointestinal system D. urinary system E. genital system
At the end of the 2008-2009 influenza season, 100% of influenza A H3N2 and the novel 2009 influenza A H1N1 were resistant to:
a. adamantane. b. oseltamivir. c. Tamiflu. d. Relenza.