The decline of the sea otter population in the Pacific Northwest has been attributed to
A. pollution from an oil spill.
B. predation by killer whales.
C. a genetic mutation causing a decrease of fertility in male otters.
D. an increase in the water temperature.
E. predation by Steller sea lions.
B. predation by killer whales.
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Compared to Eukaryotes, Bacteria and Archaea have ________ surface-to-volume ratios, causing ________ nutrient exchange and growth rates
A) lower / lower B) lower / higher C) higher / lower D) higher / higher
The ________ is responsible for the monitoring of infectious disease and the implementation of prevention and control strategies world-wide.
What will be an ideal response?
Based on which of the following pieces of evidence about the transforming agent did Avery conclude that DNA is the hereditary material?
A. In an ultracentrifuge, the material migrated like DNA. B. The purified material had the same elements as DNA. C. The material was destroyed by DNA-digesting enzymes. D. The material was not destroyed by protein-digesting enzymes. E. All of the choices are correct.
Which of the following is not a goal of
cloning? a. bring animals back from extinction. b. form replacement tissues and organs. c. increase numbers of endangered animals. d. clone valuable livestock. e. all of these are goals