Tumors can grow because of exposure to
A. Allergens
B. Parasitic organisms
C. Antigens
D. Mutagens
E. Neurotoxins
Answer: D
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The differentiation of the Earth was simultaneous with its formation from the accretion of
planetesimals. Indicate whether the statement is true or false.
The downslope movement of water-saturated surface sediment is called ____________________. Fill in the blank(s) with the appropriate word(s)
The Haber-Bosch process creates nitrogenous fertilizers by
A) extracting reactive nitrogen from soils. B) converting nitrogen gas and hydrogen to ammonia. C) extracting nitrogen oxides from the gases produced when fossil fuels are burned. D) allowing vegetative detritus to break down under anaerobic conditions.
A GIS is a library of information based on ________
A) satellites B) stereoscopic image viewing C) many land survey records stored on microfilm D) manual cartography E) maps