It has been estimated that confined animal feeding operations contribute to about _____ of world carbon dioxide emissions.
a. 5%
b. 15%
c. 25%
d. 35%
e. 45%
Answer: b. 15%
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Oxygen first began to accumulate in Earth's atmosphere as a result of ____
A) biosynthesis B) cellular respiration C) methane synthesis D) photosynthesis
The following three boxes represent the number of submicroscopic particles within a given volume of a particular substance at different temperatures. Which box represents the greatest density? Which box represents the greatest temperature? 
A. A and C B. B and A C. A and B D. B and C
What is human development index and how does it differ from inequality-adjusted HDI?
What will be an ideal response?
The mountain building events of the west coast that began in the Jurassic and continued into the
Cenozoic are collectively called the a. Sonoma orogeny. d. Rocky Mountain orogeny. b. Antler orogeny. e. Alleghenian orogeny. c. Cordilleran orogeny.