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Question 1 of 29
1.As a consequence, they are perhaps the best group of insects for examining patterns of terrestrial biotic diversity and distribution
Question 2 of 29
2. Perhaps the aspect of butterfly diversity that has received the most attention over the past century is the striking difference in species richness between tropical and temperate regions.
Question 3 of 29
3. The total number found on the British islands did not exceed 66, and the whole of Europe supported only 321.
Question 4 of 29
4. It is hoped that by focusing on them, the errors generated by imperfect and incomplete taxonomy will be minimized.
Question 5 of 29
5. The Egyptians made coarse fibers by 1600 B.C., and fibers survive as decorations on Egyptian pottery dating back to 1375 B C.
Question 6 of 29
6. the fibers were brittle, ragged, and no longer than ten feet, the circumference of the largest reels.
Question 7 of 29
7. Glass fibers were little more than a novelty until the 1930’s, when their thermal and electrical insulating properties were appreciated and methods for producing continuous filaments were developed.
Question 8 of 29
8. Deep dives are less dangerous if helium is substituted for nitrogen, because under these pressures helium does not exert a similar narcotic effect.
Question 9 of 29
As a scuba diver descends, the pressure of nitrogen in the lungs increases. Nitrogen then diffuses from the lungs to the blood and from the blood to body tissues
Question 10 of 29
10. This change in volume may cause the lungs to distend and even rupture.
Question 11 of 29
11. Advocates of organic foods – a term whose meaning varies greatly – frequently proclaim that such products are safer and more nutritious than others.
Question 12 of 29
12. There are numerous unsubstantiated reports that natural vitamins are superior to synthetic ones.
Question 13 of 29
13. In many cases consumers are misled if they believe organic foods can maintain health and provide better nutritional quality than conventionally grown foods.
Question 14 of 29
14. In the seventeenth century the organ, the clavichord, and the harpsichord became the chief instruments of the keyboard group, a supremacy they maintained until the piano supplanted them at the end of the eighteenth century.
Question 15 of 29
15. A supremacy they maintained until the piano supplanted them at the end of the eighteenth century.
Question 16 of 29
16. They produced an instrument capable of myriad tonal effects from the most delicate harmonies to an almost orchestral fullness of sound, from a liquid, singing tone to a sharp, percussive brilliance.
Question 17 of 29
17. There is archaeological evidence that counting was employed by humans as far back as 50,000 years ago although the manner of this development is largely conjectural.
Question 18 of 29
18. Probably the earliest way of keeping a count was by some simple tally method, employing the principle of one-to-one correspondence.
Question 19 of 29
19. Counts could also be maintained by making scratches in the dirt or on a stone, by cutting notches in a piece of wood, or by tying knots in a string.
Question 20 of 29
20. later, an assortment of vocal sounds was developed as a word tally against the number of objects in a small group.
Question 21 of 29
21. The best-known specimens are the remarkable tracks discovered at Lactoli, Tanzania, by Mary Leaky.
Question 22 of 29
22. The pressures exerted along the foot, together with the length of stride, which averaged 87 centimeters, indicated that the hominids had been walking slowly
Question 23 of 29
23. The study of fossil footprints is not restricted to examples from such remote periods.
Question 24 of 29
24. The motivation derived from the text, and in the case of singing, the music, in combination with the performer’s skills, personality, and ability to create empathy.
Question 25 of 29
25. How a speaker perceives the listener’s receptiveness, interest, or sympathy in any given conversation can drastically alter the tone of presentation.
Question 26 of 29
Emotional health is evidenced in the voice by free and melodic sounds of the happy, by constricted and harsh sound of the angry, and by dull and lethargic qualities of the depressed.
Question 27 of 29
When the United States became an independent nation in 1776, it did not have a single city as large as 50,000 inhabitants, but by 1820 it had a city of more than 10,000 people, and by 1880 it had recorded a city of over one million.
Question 28 of 29
28. It was not until after 1823, after the mechanization of the spinning had weaving industries, that cities started drawing young people away from farms.
Question 29 of 29
29. Modern comparisons of the amount of work performed per week, however, begin with the Industrial Revolution (1760-1840) when 10- to 12-hour workdays with six workdays per week were the norm.