1. Which of the following can be inferred from the pas s age about kelp forests in the Bering and Copper is lands between 1750 and 1768?
A. They were reduced significantly.
B. They disappeared entirely from the region.
C. They were the primary food source for sea otters .
D. They were harvested in record numbers by humans
E. They increased pressure on sea urchin populations.
2. According to the pas s age, it is likely that during the m id-1700s, s ea urchin populations near the Bering and Copper is lands
A. were diminished by sea cow predation
B. experienced substantial increases
C. migrated to waters with more plentiful food supplies
D. were reduced by the pressures of hunting
E. appeared to be malnourished
答案：AB




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