1. The Democratic Party, the most oldest existing political party in the United States, has played a vital role in the nation’s history .

2. While photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.

3. For an advertisement to be effective, its production and placement must to be based on a knowledge of human nature and a skilled use of the media.

4. Both the United States silver dollar and half-dollar, first minted in 1794, had a figure of Liberty on one side and a eagle on the reverse side.

5. Like triglycerides, cholesterol is a type of fat that is both consumed in the diet but manufactured by the body.

6. The nineteenth-century romantic movement in art was partially a reaction to what was perceived as overemphasis on reasonable and order in neoclassicism.

7. There are about 350 species and subspecies of birds in danger of become extinct, with a large number of them , 117 in all , found on oceanic islands.

8. Diamond is the hardest known substance , so diamond can be cut only by another diamonds.

9. Telescope are frequently used in astronomy to collect light from a celestial object, bring the light into focus, and producing a magnified image.

10. The mountains, especially the Rocky Mountains, formerly constituted a seriously barrier to east-west trade in British Columbia.

11. Membership in labor unions in the United States reached its peak of 17 millions members in 1960.

12. Alike a chicken, the grouse has four toes, with the hind one raised above the ground.

13. Clementine Hunter’s primitive paintings have been exhibited at various galleries, included one at the Smithsonian Institution in Washington D.C.

14. The highly respect zoologist Ernest Just joined the ruling board of the Marine Biological Laboratory in the 1930’s.

15. Most of the food what elephants eat is brought to their mouths by their trunks.

16. Applied research aims at some specific objective, such as the development of a new produce , process, or material .

17. Doppler radar can be used to determine the direction which in the particles of a cloud are moving .

18. Recause it is a healthful way to exercise aerobic dancing is considered an excellent method for release tension.

19. Vaccines for some rare diseases are given only to persons which risk exposure to the disease .

20. A major purpose of scientific analysis is to identify and examine causal connections between independent and dependence variables.

21. Pieces of eighteenth-century porcelain they are frequently dug up in excavations at williamsburg Virginia.

22. Many of society’s wealth is controlled by large corporations and government agencies .

23. Height, powerful and speed are attributes that coaches often look for in basketball players .

24. Between 1906 and 1917, political activist Emma Goldma devoted most of her efforts to writing, traveling and lectured .

25. Since the beginning of this century, the United States government has played an role in the supervision and use of the nation’s natural resources.