Which of the following correctly describes the two aromatic ring substituents in the xylenes?
A) They are both hydroxyl groups.
B) They are both methyl groups.
C) One is a methyl and one is an hydroxyl.
D) One is a methyl and one is an ethyl.
B
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Why do tropical rains forests have so much biodiversity?
A. high degree of specialization B. low degree of specialization C. dense canopy D. nutrient-poor soils
The starting point in "doing" geography is observation
Indicate whether this statement is true or false.
What apparent difference is there between a gneiss that is formed from igneous rock and one formed from sedimentary rock?
A) crystal size B) mineral content C) age D) color
What is the most common way to name a geologic period?
A) by the name of the place where rocks of that period were first described B) by the name of the tectonic continent that existed at that time C) by the name of the scientist who first defined that period D) by the name of the metamorphic processes that were occurring at that time