1. is that area of that earth where life exists. is that area of that earth where life exists. is the global sum of all ecosystems. area of the earth where life exists.

2. is an ecological unit that includes all the interacting parts of an environment in an area. There are two factors of ecosystem, the biotic and abiotic factors. 3. any living thing that influences or affects an ecosystem. 4. any non-living condition or thing, that influences or affects an ecosystem and the organisms in it. 5. is a large area identified by the presence of characteristic plants and animals. Biomes are separated into two very broad classifications: terrestrial biomes, or those on land, and aquatic biomes, or those on water. 6. the biomes found at the earths coldest extremes are the polar biomes. 7. a treeless biome blanketed by snow in the winter, forms a continuous belt across Northern America, Europe, and Asia. 8. a biome that is dominated by conifers, cone-bearing evergreen trees such as pines, firs, spruces, and cedars. 9. is a biome characterized by the presence of trees that lose their leaves in the fall. 10. is a biome dominated by grass. 11. are dry areas where rainfall averages less than 25 cm per year. 12. There are two types of rain forests biomes, the tropical rain forest and the temperature rain forest. 1. Tropical rain forest biome - is found near the equator where rainfall and sunlight abound. 2. Temperature rain forest - these are moderate temperatures and highly humidity. 13. Marine Biome is the earths ocean and its associated areas. Ecologists have subdivided marine biomes into three areas: ocean, intertidal zones, and estuaries. 14. it covers about 70 percent of the earth and has an average depth of 3.7 km. The ocean is divided into two zones: the open ocean, or pelagic zone, and the ocean bottom, or benthic zone. 15. 1.Pelagic Zone - the open ocean 2. Benthic Zone - the ocean bottom 16. Along ocean shores, the tides produce a rhythmic rise and fall of water in an area called the intertidal zone. 17. is a biome found throughout the world where fresh water rivers and streams flow into the sea. 18. Ecologists have subdivided marine biomes into three areas: Lakes and Ponds and Rivers and Streams. Low levels of dissolved salts characterized the freshwater biome. 19. It is divided into two categories. 1. Eutrophic lakes are rich in organic matter and vegetation, making the waters relatively murky. 2. Oligotrophic lakes contain little organic matter. The water is much clearer, and the bottom is usually sandy or rocky. 20. body of water that flows down a gradient, or slope, toward its mouth.