Chapter 2

2. An organism that can make its own food
3. The process by which molecules of a liquid absorb energy and change to a gas
5. A layer of shorter plants that grow in the shade of a forest canopy
7. An area populated by grasses and other nonwoody plants. Most grasslands get 25 to 75 centimeters of rain each year
8. A grassland close to the equator that receives as much as 120 centimeters of rain per year
9. A series of events in which one organism eats another and obtains energy
12. The very slow motion of the continents
18. The typical weather pattern in an area over a long period of time
19. An organism that breaks down wastes and dead organisms
21. The study of where organisms live
22. The region of shallow ocean water over the continental shelf
23. A consumer that eats only plants
25. An area that receives less than 25 centimeters of precipitation per year
26. Species that are carried to a new location by people
29. An organism that obtains energy by feeding on other organisms

1. A group of land ecosystems with similar climates and organisms
2. Soil that is frozen all year
4. The process of changing free nitrogen gas into a usable form
6. A consumer that eats only meat
9. The pattern of overlapping food chains in an ecosystem
10. A consumer that eats both plants and meat
11. A leafy roof formed by tall trees in a forest
12. A tree that produces its seeds in cones and that has needle-shaped leaves
13. A diagram that shows the amount of energy that moves from one feeding level to another in a food web
14. A tree that sheds its leaves and grows new ones each year
15. The area between the highest high-tide line and lowest low-tide line
16. An extremely cold, dry biome
17. The continuous process by which water moves from Earth's surface to the atmosphere and back
19. The movements of organisms from one place to another
20. Rain, snow, sleet, and hail
24. A habitat in which the fresh water of a river meets the salt water of an ocean
27. The process by which a gas changes to a liquid
28. A carnivore that feeds on the bodies of dead organisms