Science

3. cold winds that blow from the east to the west near the North Pole and South Pole
4. Brings oxygen into the body. Gets rid of carbon dioxide.
6. A simple machine that consists of a rope that fits into a groove in a wheel
7. tube leading from the urinary bladder to the outside of the body
11. accomplishment of completing a job with minimum use of time and effort
12. A collection of tissues that carry out a specialized function of the body
13. powerhouse of cells
17. large muscular sac that continues the mechanical and chemical digestion of food
18. a flat, sloped surface
19. moist and cold air mass
20. Single-celled organism that uses pseudopods to move

1. The continuous process by which water moves from Earth's surface to the atmosphere and back
2. A colonial form of live green algae, round in shape.
5. Winds that blow from west to east and affect the weather in the United States.
8. Point A place or object used for comparison to determine if an object is in motion
9. a simple device without moving parts that changes the magnitude or direction of a force
10. a gas molecule that is made up of three oxygen atoms. In the Stratosphere, protects us from UV radiation.
14. A force that pulls objects toward each other
15. A tiny blood vessel where substances are exchanged between the blood and the body cells.
16. A complex molecule containing the genetic information that makes up the chromosomes.