Abiome is best described as a major type of ecosystem with (answers: systems of habitats having differing climates, different animals having similar niches, groups of communities at various successional stages, distinctive rainfall temperature and organisms)

A biome is best described as a major type of ecosystem with SYSTEMS OF HABITATS HAVING DIFFERING CLIMATES. 
A biome refers to a naturally occurring community of plants and animals which occupy a particular habitat. There are different types of biomes and their classification depend on the prevailing climates in each biome and this in turn determines the types of animals, plants, soils, etc that will be found in the biome.  Examples of biomes are: deserts, rain forests, Savannah, temperate deciduous forests, grassland, tundra, etc.