16. In the eighteenth century, quilting became a common technique in the American colonies for make of coverlets sewed in floral and geometric designs.
17. The computer’s complex circuitry is miniaturized inside silicon chips, wafer-thin silicon crystals with circuits electronic etched onto them.
18. Centrifuges are widely use to separate liquids having different densities or to separate solids from liquids.
19. There is ample evidence of that about 700 million years ago, glaciers reached well into what are now tropical regions.
20. Mathematics is a tool that can help solve problems and lead to new developments in other fields, such as space flight, medical, and architecture.
21. The meter of the English poetry is determined by accented syllables rather by the quantities of vowels.
22. In the nineteenth-century United States, it was assumed that growth, change, and progressive derived mainly from individual effort and competition.
23. Swelling of the mucous membranes, cause by irritants, allergies, or infections, may block the nasal passages, making breathing difficult.
24. The spearmint plant, which grows to about three feet height, has stalkless leaves and lax, tapering spikes of flowers that are usually pink or lilac.
25. Germ theory defined precisely how diseases affect tissues and described their passage from one living creature to other.
26. The rings of the planet Uranus consists primary of boulder-sized chunks of dark matter, averaging about one meter in diameter.
27. George Inness’ rending of distance and atmosphere raised his art above the ordinarily realism of nineteenth-century American landscape painting.
28. Not much is it known about the details of the development and the acquisition of primate communication, especially in the wild.
29. Although Alaska is the state in the United States with the largest area, Texas is the one that is divide into the largest number of countries.
30. Much of the early European colonist in North America remarked on the profusion of birds, animals, and fish.
31. The dancer and choreographer Twyla Tharp grew up in Los Angeles, California, and hers childhood included comprehensive training in music and dance.
32. Telecommunication systems involve the transmission of sound, pictures, words, and other types of information by electronic means, include radio signals and satellite relays.
33. In addition to being the state capital, Albany is a focal point of trade, ship, and commerce in upstate New York.
34. Like bats, dolphins use echolocation---pulses of high-frequency sound---both to find prey and for explore their environment.
35. The American zoologist Dian Fossey conducted field studies of wild gorillas that disproved old beliefs that gorillas were violence and aggressive.
36. Delaware is the only state which the legislature can amend the state constitution without the approval of the voters.
37. The subcutis layer of the skin contains fat and muscle that insulate internal organ and act as an energy reservoir for the body.
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