Silica tetrahedra are able to link into long chains that share oxygen ions through the process of ________
A) isolation
B) precipitation
C) fission
D) polymerization
Answer: D
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The city government of ____________________ has taken measures that reduced the percentage of days each year in which air pollution standards are violated from 50% to 20%. The government banned cars from the central city area; phased in cleaner, more fuel-efficient vehicles; and planted more green space.
Fill in the blank(s) with the appropriate word(s).
Give three examples of limiting factors for populations of organisms in aquatic systems.
What will be an ideal response?
What advantages are there to synthesizing a naturally occurring medicine, such as Taxol, in the laboratory rather than isolating it from nature?
A. Synthesizing a natural product can be advantageous when the source of the natural product is rare and thus not readily available. B. In synthesizing the natural product in the laboratory, the chemist is able to create closely related compounds that may have even greater medicinal properties. C. In synthesizing the natural product in the laboratory, a chemist can increase the concentration of the synthetic beyond that of natural product to insure maximum potency for good health. D. Both A and B are true.
The system approach regards mountains as the products of three closely interdependent components. Which of the following is not one of those components?
A. meteor impacts B. plate tectonics C. climate D. erosion