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1. There is evidence that prehistoric humans used fire _____ 400,000 B. C.


2. In the late 1800’s Ellen Richards, began work in the new field of “sanitary science” which was concerned with waste removal, water purification and _____.


3. ____ red clover, high in protein content, is an extremely important leguminous hay and pasture plant of the eastern United States.


4. The topology of Mars is more _____ than that of any other planet.


5. Ostriches are _____ of living birds, attaining a height from crown to foot of about 2.4 meters and a weight of up to 136 kilograms.


6. The glaciers that reached the Pacific Coast were valley glaciers, and between those tongues of ice _____ that allowed the original forests to survive.


7. _____ orbits the Sun, Uranus rotates on its axis, an imaginary line through its center.


8. _____ duties are placed on commodities according to their value.


9. _____ about individuals who really existed and things that actually happened.


10. _____ matter in one form is transmuted to another form, a phase change is said to have taken place.


11. Vervet monkeys have a well-developed systems vocal communication.


12. The invention of a cotton gin by Eit Whitney in 1793 made cotton yarn more economy than linen yarn.


13. Scientists has found that the saliva of the octopus contains a substance that functions as a powerful heart stimulant.


14. The katydid, a type of grasshopper, is actively at night and rests motionless amid foliage during the day.


15. Soap is used as a lubricant in making tiny wires for electrical appliances such television sets and telephones.


16. Although the art of sand painting originated with neighboring Pueblo Indians, the Navajo Indians have refined and richly reinterpreted they symbology and execution.


17. In 1967, Canada’s year centennial, one and a quarter million people from all over the world visited Parliament Hill in Ottawa.


18. The General Sherman tree, a giant sequoia in California, has grown to be the world’s largest plant at approximate 272 feet tall.


19. Since the turn of the century, the number of Native Americans living in Canada is increased.


20. Eleanor Roosevelt played a leading part in women’s organizations, and she was active in encouraging youth movements, in promoting consumer welfare, and to work for civil rights.