1.
When _____ from milk, the remainder is called skim milk.
2.
The Buffalo River in Arkansas was designated __ in 1972.
3.
Much of northern Canada lies within the Arctic Circle, and __ ice or the sparse vegetation known as tundra.
4.
Manipulation of the spinal column, massage, and dietary adjustments __ used in chiropractic therapy.
5.
Giant corporations __ to dominate the United States economy in the late nineteenth century, grew steadily larger during the 1920%.
6.
The tradition of the bowhead whale hunt ____ back a thousand years and is a vital part of Inuit culture.
7.
____ the son of an impoverished farmer, was born on Long Island.
8.
The primary digestive function of the throat and esophagus is __ swallowed materials from the mouth to the stomach.
9.
Insulin is manufactured by specialized cells in the pancreas and released ____ glucose reaches a certain concentration in the bloodstream.
10.
One of the basic principles of wildlife conservation involves _____adequate natural food and shelter to maintain populations of each species in a given habitat.
11.
In 1974 the space probe Mariner 10 discovered ______Mercury's surface is cratered by meteorite impacts.
12.
In the diurnal type of tidal oscillation, the alternate rise and fall of sea level, a single high water and a single low water occur _____ tidal day.
13.
The chief justice of the United States presides over the Supreme Court during oral arguments and in conferences _____
14.
By focusing on the interesting, __ the significant, the penny press newspapers of the 1830's helped to change the concept of news.
15.
Documentary evidence supports claims that ____ the New World about AD 1000.
