| A | B |
|---|
| COMMUNITY | A GROUP OF INTERACTING POPULATIONS THAT OCCUPY THE SAME AREA AT THE SAME TIME |
| LIMITING FACTOR | ANY ABIOTIC OR BIOTIC FACTOR THAT RESTRICTS THE NUMBERS, REPRODUCTION, OR DISTRIBUTION OF ORGANISMS |
| TOLERANCE | THE ABILITY OF ANY ORGANISM TO SURVIVE WHEN SUBJECTED TO ABIOTIC OR BIOTIC FACTORS |
| ECOLOGICAL SUCCESSION | THE CHANGE IN AN ECOSYSTEM THAT HAPPENS WHEN ONE COMMUNITY REPLACES ANOTHER AS A RESULT OF CHANGING ABIOTIC AND BIOTIC FACTORS |
| PRIMARY SUCCESSION | THE ESTABLISHMENT OF A COMMUNITY IN AN AREA OF EXPOSED ROCK THAT DOES NOT HAVE ANY TOPSOIL |
| SECONDARY SUCCESSION | THE ORDERLY AND PREDICTABLE CHANGE THAT TAKES PLACE AFTER A COMMUNITY OF ORGANISMS HAS BEEN REMOVED BUT THE TOPSOIL REMAINS INTACT |
| PIONEER SPECIES | THE FIRST SPECIES TO START SECONDARY SUCCESSION |
| CLIMAX COMMUNITY | THE STABLE, MATURE COMMUNITY THAT RESULTS WHEN THERE IS LITTLE CHANGE IN THE COMPOSITION OF SPECIES |
| WEATHER | THE CONDITIONS OF THE ATMOSPHERE AT A SPECIFIC PLACE AND TIME |
| LATITUDE | THE DISTANCE OF ANY POINT ON THE SURFACE OF EARTH NORTH OR SOUTH OF THE EQUATOR |
| CLIMATE | THE AVERAGE WEATHER CONDITIONS IN AN AREA: TEMPERATURE AND PRECIPITATION |
| TUNDRA | TREELESS: PERMAFROST |
| BOREAL FOREST | ALSO KNOWN AS THE NORTHERN CONIFEROUS FOREST OR TIAGA: LACKS PERMAFROST LAYER |
| TEMPERATE FOREST | COMPOSED MOSTLY OF BROAD-LEAD DECIDUOUS TREES THAT SHED THEIR LEAVES IN AUTUMN |
| WOODLAND (TEMPERATE WOODLAND) | MIXED SHRUB COMMUNITIES: LESS RAINFALL THAN TEMPERATE FOREST |
| GRASSLAND | FERTILE SOILS: THICK COVER OF GRASSES: OKLAHOMA |
| DESERT | ANY AREA IN WHICH THE ANNUAL RATE OF EVAPORATION IS EXCEEDS THE RATE OF PRECIPITATION |
| TROPICAL SAVANA | GRASSES AND SCATTERED TREES: LESS PRECIPITATION THAN OTHER TROPICAL AREAS: AFRICA |
| TROPICAL SEASONAL FOREST | RESEMBLE TEMPERATE DECIDIOUS FORESTS: AFRICA, ASIA, AUSTRALIA, AND SOUTH AND CENTRAL AMERICA |
| TROPICAL RAIN FOREST | THE MOST DIVERSE OF ALL LAND BIOMES |
| BIOME | A LARGE GROUP OF ECOSYSTEMS THAT SHARE THE SAME CLIMATE AND HAVE SIMILAR COMMUNITIES |
| SEDIMENT | MATERIAL DEPOSITED BY WATER, WIND, OR GLACIERS |
| LITTORAL ZONE | LAKE AREA CLOSEST TO THE SHORE: AREA OF HIGH PHOTOSYNTHESIS |
| LIMNETIC ZONE | LAKE: OPEN WATER: WELL LIT: DOMINATED BY PLANKTON: MANY FISH |
| PLANKTON | FREE-FLOATING PHOTOSYNTHETIC AUTOTROPHS |
| PROFUNDAL ZONE | LAKE: MINIMAL LIGHT: COLD: LOWER OXYGEN |
| WETLANDS | AREAS OF LAND SUCH AS MARSHES, SWAMPS, AND BOGS THAT ARE SATURATED WITH WATER AND SUPPORT AQUATIC PLANTS |
| ESTUARY | WHERE FRESHWATER AND SALTWATER MIX |
| INTERTIDAL ZONE | WHERE THE OCEAN MEETS LAND: SPRAY ZONE, HIGH-TIDE ZONE, MID-TIDE ZONE, LOW-TIDE ZONE |
| PHOTIC ZONE | OCEAN: SUNLIGHT CAN PENETRATE |
| APHOTIC ZONE | OCEAN: LESS SUNLIGHT |
| BENTHIC ZONE | AREA ALONG THE OCEAN FLOOR WHERE SAND, SILT, AND DEAD ORGANISMS ARE FOUND |
| ABYSSAL ZONE | DEEPEST REGION OF THE OCEAN |
| DETRITUS | MADE UP OF TINY PIECES OF ORGANIC MATERIAL |
| OLIGOTROPHIC LAKE | LAKES FOUND HIGH IN THE MOUNTAINS: NUTRIENT POOR |
| EUTROPHIC LAKE | LAKES IN LOWER ALTITUDES: NUTRIENT-RICH |
| MOUNTAINS | NOT CONSIDERED A BIOME BECAUSE CLIMATE CHARACTERISTICS AND PLANTS AND ANIMALS DEPEND ON ELEVATION |
| POLAR REGIONS | COLDEST TEMPERATURE EVER RECORDED: FOUND AT THE POLES |
