How was the role of MHC molecules first discovered?
A) during the study of AIDS
B) during studies of blood types
C) during organ transplants
D) none of the above
C
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Which nation in Latin America remains the top producer of cocaine?
A) Peru B) Argentina C) Chile D) Colombia E) Brazil
?Match the term with the most appropriate description.
A. ?open, sunlit surface layer away from the shore B. ?large natural bodies of standing freshwater C. ?deeper water lying between the limnetic zone and the lake bottom D. ?lakes that have a small supply of plant nutrients E. ?land area that delivers runoff to a stream, lake, or wetland
Coral reefs
A) require water that is high in sediment concentrations. B) are made of animals living symbiotically with simple algae. C) tend to occur poleward of 30° N/S. D) survive in a broad ecological range because they are tolerant of temperature, salinity, and depth variations. E) are found primarily in deep oceans.
Negative feedback processes tend to function within ecosystems to ________
A) cause further ecological destruction B) cause ecological relationships to flourish C) cause ecological relationships to disintegrate D) reinforce harmful changes E) stabilize the ecosystem