Genetic information is contained in coded units on chromosomes called
a. DNA molecules
b. Genes
c. Macromolecules
d. Nucleotides
e. Proteins
B
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Hydrocarbons release a lot of energy when ignited. Where does this energy ultimately come from?
A. the formation of chemical bonds B. photosynthesis C. the breaking of chemical bonds D. nuclear fusion in the sun
Historical records of volcanic eruptions ____
a. ?are used effectively by land use planners and developers b. ?cannot be used for prediction since volcanoes are inherently unpredictable c. ?are effective in identifying areas at risk for volcanic dangers d. ?are difficult to obtain since they depend on written history e. ?are easily used to accurately predict the time of an eruption
A beach that is fed by mixed sizes of rocks and particles but shows only large rocks on its surface is ________.
A. subjected to high waves and strong currents B. an erosional beach C. an armored beach D. All of these are correct. E. None of these is correct.
A(n) __________ region is a spatial unit characterized by a central focus on some kind of activity, typically economic
Fill in the blank(s) with correct word