A ________ epidemic is characterized by a relatively slow and prolonged rise then a gradual decline in the number of individuals infected.
A. propagated
B. common-source
C. sporadic
D. herd
Answer: A
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Eight hundred million years ago, what change in atmospheric conditions coincided with an increase in eukaryotic diversity?
A. decrease in CO2 B. increase in O2 C. increase in sulfur D. None of these choices are correct.
Secondary xylem is formed in association with the
a. pith. b. inner face of vascular cambium. c. outer face of vascular cambium. d. inner face of cork cambium. e. outer face of cork cambium.
The salt gradient created by the kidney tubules ____
a. occurs only in the proximal tubules b. inhibits the reabsorption of water c. draws water out of the ascending arm of the loop of Henle d. occurs only within the kidney cortex e. drives the reabsorption of other solutes and water
Arteries differ from veins in that
A. veins carry blood to the internal organs of the body. B. arteries have valves that veins do not have. C. veins have thinner walls than arteries. D. the pressure in veins is greater than that in arteries.