Primary productivity is dependent upon all of the following EXCEPT for the ____
a. number of plants in the ecosystem
b. rate of photosynthesis
c. rate of energy use by plants
d. sunlight and rainfall amounts
e. levels of oxygen
ANSWER: e
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The blood vessels of the umbilical cord are formed by which extraembryonic membrane?
a. yolk sac b. chorion c. allantois d. amnion e. placenta
Hormones are distributed throughout the body
by
a. the urinary system. b. the lymphatic system. c. the nervous system. d. the circulatory system. e. more than one of these systems
Blood in arteries
1.always travels away from the heart. 2.travels away from the heart only if it is oxygen-rich. 3.always travels toward the heart. 4.travels from the lungs. 5.is always oxygen-rich.
Most of the carbon dioxide in the blood is transported:a
dissolved in plasma. b. as bicarbonate ions. c. by hemoglobin. d. as carbonic anhydrase. e. as carbonic acid.