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11. Acids are chemical compounds that, in water solution, have a sharp taste, a corrosive action on metals, and the ability to turn certain blue vegetable dyes red.
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12. Billie Holidays reputation as a great jazz-blues singer rests on her ability to give emotional depth to her songs.
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13. Essentially, a theory is an abstract, symbolic representation of what is conceived to be reality.
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14. Long before children are able to speak or understand a language, they communicate through facial expressions and by making noises.
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15. Thanks to modern irrigation, crops now grow abundantly in areas where once nothing but cacti and sagebrush could live.
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16. The development of mechanical timepieces spurred the search for more accurate sundials with which to regulate them.
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17. Anthropology is a science in that anthropologists use a rigorous set of methods and techniques to do*ӢZW*ent observations that can be checked by others.
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18. Fungi are important in the process of decay, which returns ingredients to the soil, enhances soil fertility, and decomposes animal debris.
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19. When it is struck, a tuning fork produces an almost pure tone, retaining its pitch over a long period of time.
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20. Although pecans are most plentiful in the southeastern part of the United States, they are found as far north as Ohio and Illinois.
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