Tuberculosis is caused by
A. mosquitoes.
B. houseflies.
C. viruses.
D. bacteria.
E. protozoa.
Answer: D
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A species of lizard has gone extinct. All of the following may have contributed to this extinction except ________
A) introduction of a species that competed for food resources B) increased genetic diversity within the species C) climate change D) inbreeding E) habitat destruction by humans
A basin designed to hold surplus surface runoff, keeping it out of a stream is
A. a drainage basin. B. an oxbow lake. C. a retention pond. D. a delta.
Which of the following is the correct relationship between the rad and the gray?
A) 1 Gy = 100 rad B) 1 Gy = 1000 rad C) 1 Gy = 0.01 rad D) 1 Gy = 0.001 rad
The main mechanism for melting at spreading ridges is decompression melting of ultramafic mantle rock
Indicate whether the statement is true or false