All of the following are true statements about life zones EXCEPT:
a. Life zones are very broad geographical regions with similar physical characteristics.
b. Terrestrial life zones are typically described by the dominant type of vegetation.
c. Animals typically moved readily between different life zones in a geographical area.
d. Each continent is made up of many different life zones
C
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Colds are the MOST infectious viral diseases
Indicate whether the statement is true or false.
Which one of the following is absolutely necessary for diffusion to occur?
a. a living cell b. a phospholipid bilayer c. a selectively permeable membrane d. a concentration gradient e. a solution
Viral-infected human cells often send out special proteins that serve as an early warning system to uninfected cells. In response, the uninfected cells develop antiviral proteins that protect them
The early warning proteins sent out by viral-infected cells are A) complement. B) interferon. C) antibodies. D) antigens. E) antibiotics.
Which of the following groups does not include many planktonic species?
A) kinetoplastids. B) foraminferans. C) diatoms. D) dinoflagellates. E) radiolarians.