Background: In studying ecology, we will look at a variety of different factors, both biotic and abiotic, which influence living organisms and the biomes in which they live. There are about eight general biome types- tropical rain forest, desert, coniferous forest, temperate deciduous forest, tundra, chaparral, grasslands, and aquatic (both oceanic and freshwater). However, these basic biome categories are simply generalizations, under which, there are many more specific biomes with unique features localized to particular geographic regions. The two dominant factors that predict biome types are precipitation and temperature, both of which are associated with the general climate of an area, which is primarily dictated by geographic latitude.