Biodiversity scientists view the worldwide decline in bird species with alarm because
A. birds are protected under the Endangered Species Act.
B. birds are an important source of food for many people.
C. birds are excellent environmental indicators.
D. birds live in nearly every climate and biome.
E. about three fourths of all bird species live in forests.
Answer: A
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a. turbidites b. tektites c. authigenic d. oozes
Carbon-12 and carbon-14 are isotopes of carbon. These isotopes differ in the number of
A) protons. B) neutrons. C) electrons. D) protons, neutrons, or electrons.
Most persistent organic pollutants enter food webs at the level of
A) primary producers. B) primary consumers. C) secondary consumers. D) decomposers and detritus feeders.
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a. ?the California current. b. ?oceanic fronts. c. ?upwelling. d. ?cold air moving over the water. e. ?evaporation.