Most mutations

A. proceed though a set of programmed sequences.
B. enable individuals to evolve by becoming genetically different.
C. occur from exposure to external agents such as radioactivity.
D. cannot be passed along through reproduction cells.
E. result from random changes that occur in coded genetic instructions.


Answer: E

Environmental & Atmospheric Sciences

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The B layer in this soil is loess. What soil order does it belong to?



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C) Aridisol
D) Ultisol
E) Mollisol

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Most foreign exchange comes to Central Africa from

A. forest products B. plantation plant products C. animal products D. mining

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Answer the following statement true (T) or false (F)

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Over warm oceans, water vapor comprises as much as ________ percent of the volume of the atmosphere

A) 1 B) 4 C) 10 D) 25 E) 50

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