At their maximum extent, how much land did glaciers cover?
a. 10%
b. 20%
c. 30%
d. 50%
e. 75%
c
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Which of the following statements about radiation is true?
A. Radiation damages cells beyond repair. B. Your body contains a number of radioactive isotopes. C. Radiation can make you glow in the dark. D. Several small exposures over time has the same negative effect as one large exposure that totals the same amount. E. One rem is enough to kill approximately 50% of the average population.
At noon on February 21, the Sun is overhead ________
at the equator at some point between the Tropic of Capricorn and the equator, heading southward at some point between the Tropic of Cancer and the equator, heading northward at some point between the Tropic of Capricorn and the equator and the equator, heading northward
The venom from a pit viper causes all of the following effects, EXCEPT:
A) local tissue necrosis. B) increased blood clotting. C) neuromuscular dysfunction. D) increased vascular permeability.
Most hurricanes move westward over tropical waters
a. True b. False