The shoulder joint where the humerus meets the pectoral girdle is an example of a
A) hinge joint.
B) ligament.
C) pivot joint.
D) ball-and-socket joint.
Answer: D
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Why are changes in the global carbon cycle important?
I) Burning reduces available carbon for primary producers and, therefore, primary consumers. II) Deforestation and suburbanization reduce an area's net primary productivity. III) Increasing atmospheric concentrations of carbon dioxide could alter Earth's climate. IV) By using fossil fuels we are destroying a nonrenewable resource. A) only I and III B) only II and IV C) only I, II, and IV D) only II, III, and IV E) only I, II, III, and IV
The sensors in the brainstem breathing control centers respond primarily to the concentration of
A. oxygen. B. carbon dioxide. C. bicarbonate ions. D. hemoglobin. E. hydrogen ions.
The material responsible for transformation was shown to be DNA by
A. Watson and Crick. B. Avery, MacLeod, and McCarty. C. Lederberg. D. Stanley.
Diatoms tend to be grazed in temperate coastal waters by:
a. amphipods. b. dinoflagellates. c. copepods. d. lobsters. e. radiolarians