What percentage of the earth is covered by
deserts?
a. 7%
b. 12%
c. 18%
d. 20%
e. 26%
D
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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.
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
All the following have some sort of hardened
endoskeleton EXCEPT a. sea stars. b. sea urchins c. fish. d. sea anemones. e. turtles.
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.