Describe the major features of a biome.

The term "biome" refers to a zone that contains lifeforms that share a set of common characteristics as a result of living and developing in similar climates and environments. The same biomes can be found across continents as long as the different regions share the same environmental characteristics. A single biome can contain a number of different habitats and ecosystems. Therefore, it is important not to confuse biomes with these two other terms. Simply put, an ecosystem refers to any system, large or small, in which living and non-living things interact with each other. A habitat is a physical space in which living things exist.
Biomes are categorized in different ways by different researchers, but generally, seven major terrestrial biomes are recognized (see NASA source below). These are shrubland, tundra, rainforest, desert, temperate deciduous forest, coniferous forest, and grassland. There are also aquatic biomes, such as shallow seas and intercoastal zones. Species that inhabit a particular biome may vary in many respects, but they will likely share certain features which enable them to live there. It is possible to divide large biomes into smaller sub-biomes or micro-biomes, such as deciduous forest and lowland tropical rainforest. Even the human gut and digestive tract, which hosts many different bacteria, can be considered a micro-biome.
http://www.theglobaleducationproject.org/earth/global-ecology.php