Pangaea
A) was centered in the tropics.
B) began to break apart about 20 million years ago.
C) was not affected by plate tectonics.
D) is not supported by scientific evidence.
E) all of the above
A
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Which of the following gives the name for the small, smooth cloud that may form just above the top of a towering cumulus cloud?
A. banner cloud B. contrail C. mammatus cloud D. pileus cloud
Faunal and floral diversity decrease when continents break up, and increase when continents join together in larger
landmasses. a. True b. False
By 2025, demographers predict that what percentage of the world will be living in urban areas?
A) about 60% B) approximately 30% C) at least 50% D) a little less than 70% E) almost 90%
In toxicology studies, LD50 can be best described as the dose ________
A) at which 50% of an exposed population develops disease B) at which 50% of an exposed population develops a chronic effect from the toxicant C) in which at least 50% of the exposed population is not affected by the toxicant D) at which 50% of an exposed population is killed or displays a specific symptom E) in which more than 50% of the population dies as a result of the toxicant development