A desert consisting of a large area of sand dunes is termed a(n) ________
A) reg
B) erg
C) arroyo
D) wadi
E) salina
Answer: B
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Which environmental impact of underground mining is considered to be the most serious?
a. underground explosions b. underground flooding c. acid mine drainage d. ground subsidence e. overburden collaps
Many strategies have been used to control leafy spurge, including the deliberate introduction of different species of flea beetles that feed on leafy spurge. Each flea beetle female may lay about 200 eggs in her one-year life span
In places where flea beetle introductions have quickly established large populations that have grown and stabilized, the population growth of these beetles most likely looked like which of these on a graph? A) A straight increasing line B) A J-shaped curve C) An S-shaped curve D) An upside down U-curve
The H1N1 flu virus is common in ________ but rarely transmitted to humans until recently
A) pigs B) waterfowl C) mosquitoes D) poultry E) birds
Which of the following correctly describes satellites?
A) They are DNA molecules in which long nucleotide sequences are repeated a few times. B) They are DNA molecules in which long nucleotide sequences are repeated many times. C) They are DNA molecules in which short nucleotide sequences are repeated a few times. D) They are DNA molecules in which short nucleotide sequences are repeated many times.