In 1964, _______ of Henry Ossawa Tanner's paintings was shown at the Smithsonian Institution.

In order to remain in existence,_________ must, in the long run, produce something consumers considers useful or desirable.

________ dates from the end of the eighteenth century.

Because of the Aleuts' constant exposure to cold weather, they have long recognized__________.

From 1946 to 1949, ________ William Henry Hastie served as governor of the Virgin island

Quarsas______ emiting extremely intense radio waves and visible radiation

In 1961, the entertainer Chubby Checker intoduced a________ to New York's rock'n'roll fans.

Possibly the greatest advance in__________ materials came with the invention of a cheap way to make steel.

True hibernation takes place only among _________ animals.

Different species of octopuses may measure anywhere from two inches to over thirty feet in long

At birth, an infant exhibits a remarkable number of motor response

A emotion is not necessarily aroused by something in the outside world

If a atom loses any of its electrons, it becomes positively charged and can combine chemically with other atoms.

Flower have long been cultivated and bred for their beauty and their fragrance .

In nature, the distibutive of plants is obviously related to climate

A electric current can consist of charges that are positive, negative or both.

Like some other running birds, the sanderling lack a back toe and has a three- toed feet.

The free silver movement, promoting unlimited silver coinage, gained prominent, in 1800's

Metabolism consists of a complicated series of chemicals reaction carried out by living cells