When organic chemists draw the structure of a cycloalkane, which of the following do they most frequently write?
A) all the C and H atoms
B) only the C atoms
C) only the polygon with as many sides as there are carbon atoms
D) the appropriate polygon and all the C and H atoms
C
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Strains of genetically modified food crops can hybridize with wild crop varieties when
a. The process is carefully controlled in an agricultural lab. b. Pollen blows from the genetically modified crop and spreads among wild varieties. c. Pollen is transferred by the farmer from one crop to the other. d. It is not possible for a genetically modified plant to hybridize with a wild species. e. More than one of these answers is correct
The natural regions that have the best soils, in order of most productive or fertile to least productive or fertile, are taiga, mixed forest, and steppe
Indicate whether the statement is true or false
Which of the following best describes the fumaroles that exist in Yellowstone National Park?
A) Hot springs so hot that they create steam and vent sulfuric acid B) Lava deposits that are constantly heated from superheated gases in the ground below. C) Smoke from lava pits below ground that vent to the surface through cracks. D) Lakes that are heated by underground pyroclastic flows.
The interrelationship of the hydrosphere, geosphere, biosphere, and atmosphere is visualized through the hydrogeologic cycle.
Answer the following statement true (T) or false (F)