What is significant about the North American Boreal Forest?
A) also known as a taiga or "snow forest"
B) nursery to 3 billion birds
C) regulates climate and carbon levels
D) rising temperature is biggest threat
E) all of the above
Answer: E
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Temperature increases with altitude through most of the stratosphere because ________
A) sunlight is more intense in the stratosphere B) greenhouse gases warm the air C) jet stream winds produce frictional heat D) heat is released when oxygen and ozone absorb the sun's UV radiation E) water vapor levels are high and store heat
Which of the following is true of heparin?
A) It is an oligosaccharide. B) It has a formula weight of 6,000 g/mol. C) It has a formula weight of 30,000 g/mol. D) It has a range of formula weights, from of 6,000 to 30,000 g/mol.
In 2003 the world fishing fleet spent over ________ billion to catch $80 billion worth of fish
A) $60 B) $80 C) $100 D) $120 E) $140
________ has extensive loess deposits up to 100 meters thick.
A. California B. Brazil C. Ireland D. Canada E. China