SECTION 2 TIME—25 MINUTES 18 QUESTIONS DIRECTIONS
4.
According to the passage, which of the following is a
factor that is threatening the survival of coral reef
describes coral reef communities as paradoxical most
likely for which of the following reasons?
communities?
(A) They are thriving even though human activities
(A) The waters they inhabit contain few nutrient
have depleted the nutrients in their environment.
resources.
(B) A decline in nutrient input is disrupting their
(B) They are able to survive in spite of an
symbiotic relationship with zooxanthellae.
overabundance of algae inhabiting their waters.
(C) They are able to survive in an environment with
(C) The degraded waters of their marine habitats
limited food resources.
have reduced their ability to carry out
photosynthesis.
(D) Their metabolic wastes contribute to the
degradation of the waters that they inhabit.
(D) They are too biologically complex to survive in
habitats with minimal nutrient input.
(E) They are declining even when the water
surrounding them remains clear.
(E) Waste by-products result in an increase in
nutrient input to reef communities.
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Two divergent definitions have dominated sociologists'
discussions of the nature of ethnicity. The first emphasizes