The most important source of airborne pollutants is ________
Fill in the blank(s) with the appropriate word(s).
Answer: human activity
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A nation-state is a relatively diverse cultural group with its own fully independent political territory
Indicate whether the statement is true or false
Which type of fossil results from burying a shell in sediment and then dissolving the shell with underground water?
If two protons and two neutrons are removed from the nucleus of an oxygen atom, a nucleus of which element remains?
A. carbon-12 B. nitrogen-12 C. carbon-14 D. neon-18
The Everglades restoration project in Florida ________
A) is a short-term restoration project with a two-year implementation plan B) will probably destroy much of the commercial fishing in the area C) seeks to exterminate numerous invasive fish species and plants D) will restore natural levels of water flow by undoing numerous damming and drainage projects E) will result in serious depletion of drinking water supplies for humans in south Florida