What is the source of organic material in coal?
A. Marine algae
B. Land plants
C. Dinosaurs
D. Diamonds
Answer: B
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The _____________ separates China and Mongolia.
Fill in the blank(s) with the appropriate word(s).
A line of thunderstorms that forms ahead of an advancing cold front is called a ____
A) squall line B) wall cloud C) gust front D) dry line
Density-dependent factors ________
A) include the effects of disease, predators, and food on a single species within a community B) include the effects of rainfall on an entire community C) cause decreases in the number of species in an ecosystem D) include the effects of a hard freeze on a single species within a community E) include the effects of a hard freeze on an entire community
All of the following pollutants were targeted for reduction by 2010, according to The 1999 Protocol, except ________
A) nitrous oxide B) ammonia C) sulfur dioxide D) CFCs E) VOCs