| A | B |
|---|
| aquatic organisms that live atteched to the ocean floor | Benthos |
| a distinctive geographic regions of the world characterized by dominant plants or animals | Biome |
| permanently frozen soil layer of the tundra | Permafrost |
| biome with harsh winters | Tundra |
| thin layer of earth's surface, composed of biomes, ocenans, and ecosystems | Biosphere |
| first stage of primary succession that begins with hardy organisms | Pioneer Stage |
| in ecological succession, the final community that is complex | Climax Community |
| biome characterized by heavy rainfall and constant warm tempertaures | Tropical Rain-Forest |
| aquatic organisms that are carried by ocean currents rather than swimming freely | Plankton |
| biome characteruzed by less than 25 cm yearly, poor soil, and little plant and animal life | Desert |
| deepest region of the ocean in which there is no light and no photosynthesis | Oceanic Zone |
| biome characterized by definite seasons, layers of vegetation, and deciduous trees | Temperate Forest |
| gradual process by which communities change over time | Ecological Succession |
| shallow, lighted zone of the ocean but above coninental shelf | Neritic Zone |
| biome characterized by coniferous froests, frequent fog, and acicic soil | Taiga |
| succession that begins in areas in which there is no life | Primary Succession |
| Nekton aquatic organisms that swim freely through the oceans | Nekton |
| energy fo the ocean floor communities that is released as heat energy from earth's interior | Geothermal Energy |
| microenvironmentduring each stage of succession, the slightly different environment is created as organisms grow and affect their surroundings | Microenvironment |
| Grasslandbiome in which grasses are the major species | Grassland |
