Plastics are ________
A) moldable, petroleum-based hydrocarbons
B) naturally occurring macromolecules
C) assembled by enzymes in cells
D) synthetic proteins
E) unstable and break down easily
Answer: A
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Suppose the rising air parcel is warmer and less dense than the air around it. In this case, the atmosphere is ____
A) absolutely stable B) absolutely unstable C) convectively unstable D) conditionally unstable
How do soils become fertile?
A) deep and thorough leaching of parent material to release nutrients B) mild weathering of parent material and addition of organic matter C) human manipulation to retain moisture and improve texture D) intimate interaction with the soil biota
Which of the following sections along the San Andreas fault remained as a seismic gap as of late 2015?
A. The central "creeping" section B. Loma Prieta C. Parkfield D. The Crystal Springs area south of San Francisco
What country is the largest debtor in the world measured by absolute external debt? This debt of this country is valued at $10 trillion
A) Brazil B) China C) India D) Russia E) United States