What percentage of the earth is covered by

deserts?



a. 7%
b. 12%
c. 18%
d. 20%
e. 26%


D

Biology & Microbiology

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Each branch point or node of a phylogenetic tree represents:

A. an environmental pressure for evolution. B. a mutational event that leads to two species. C. common ancestor to two connected branches. D. the beginning of a new domain. E. the point when life started on earth.

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What two factors influence the distribution of seaweeds the most?

a. Light and nitrogen b. Temperature and light c. Light and carbon dioxide d. Temperature and nitrogen

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All the following have some sort of hardened

endoskeleton EXCEPT a. sea stars. b. sea urchins c. fish. d. sea anemones. e. turtles.

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A narrowing of the coronary arteries may

a. be treated by balloon angioplasty b. cause a heart attack. c. be treated by coronary bypass surgery. d. be treated by laser e. include all of these.

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