| A | B |
|---|
| System | all living and nonliving things existing togethet; also called an ecosystem |
| Habitat | place where an organism lives |
| Population | a group of the same kind of organisms that live in the same place |
| Community | all of the populations sharing an area or region |
| Desert | a dry, hot habitat that receives very little rain each year |
| Grassland | a dry, large land region in which the climate does not support tree growth |
| Rain Forest | a wet, hot, habitat, with large amounts of rainfall and warm year-round temperatures |
| Forest | an area with a variety of trees, where the plants and animals change as the seasons change |
| Swamp (marsh) | a low, wetland area that has a variety of animal and plant life |
| Stream (river) | a flowing body of water that begins with melting glaciers or water runoff from mountaintops |
| Ocean | Bodies of salt water that cover about 70% of the Earth's surface and provide ninety-seven percent of the Earth's water supply |
