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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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
A resilient species or ecosystem is one that can recover quickly from disturbance
Indicate whether the statement is true or false
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