Most of the eastern United States was originally covered with ________
A) grasslands
B) savanna
C) midlatitude forest
D) boreal forest
E) tundra
Answer: C
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A resilient species or ecosystem is one that can recover quickly from disturbance
Indicate whether the statement is true or false
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
Which of the following is a cultural hazard?
A) UV radiation from the sun B) an earthquake C) a high-fat diet D) flooding E) Zika virus
About 80% of the ocean's water is found in the ________
A) thermocline B) deep zone C) euphotic zone D) pycnocline E) surface zone