25. The mechanism by which brain cells store memories is not clearly understood.

26. By the middle of the twentieth century, painters and sculptors in the United States had begun to exert a great worldwide influence over art.

27. In the eastern part of New Jersey lies the city of Elizabeth, a major shipping and manufacturing center.

28. Elizabeth Blackwell, the first woman medical doctor in the United States, founded the New York Infirmary, an institution that has always had a completely female medical staff.

29. Alexander Graham Bell once told his family that he would rather be remembered as a teacher of the deaf than as the inventor of the telephone.

30. Because its leaves remain green long after being picked, rosemary became associated with the idea of remembrance.

31. Although apparently rigid, bones exhibit a degree of elasticity that enables the skeleton to withstand considerable impact.

32. That xenon could not form chemical compounds was once believed by scientists.

33. Research into the dynamics of storms is directed toward improving the ability to predict these events and thus to minimize damage and avoid loss of life.

34. The elimination of inflation would ensure that the amount of money used in repaying a loan would have the same value as the amount of money borrowed.

35. Futurism, an early twentieth-century movement in art, rejected all traditions and attempted to glorify contemporary life by emphasizing the machine and motion.

36. One of the wildest and most inaccessible parts of the United States is the Everglades where wildlife is abundant and largely protected.

37. Lucretia Mott’s influence was so significant that she has been credited by some authorities as the originator of feminism in the United States.

38. The activities of the international marketing researcher are frequently much broader than those of the domestic marketer.

39. The continental divide refers to an imaginary line in the North American Rockies that divides the waters flowing into the Atlantic Ocean from those flowing into the Pacific.

40. Studies of the gravity field of the Earth indicate that its crust and mantle yield when unusual weight is placed on them.

41. The annual worth of Utah’s manufacturing is greater than that of its mining and farming combined.

42. The wallflower is so called because its weak stems often grow on walls and along stony cliffs for support.

43. It is the interaction between people, rather than the events that occur in their lives, that is the main focus of social psychology.
44. No social crusade aroused Elizabeth Williams’ enthusiasm more than the expansion of educational facilities for immigrants to the United States.

45. Quails typically have short rounded wings that enable them to spring into full flight instantly when disturbed in their hiding places.

46. According to anthropologists, the earliest ancestors of humans that stood upright resembled chimpanzees facially, with sloping foreheads and protruding brows.