A biome (/ˈb.m/) is a distinct biogeographical unit consisting of a biological community that has formed in response to a shared regional climate.[1][2] Biomes may span more than one continent. Biome is a broader term than habitat and can comprise a variety of habitats.

One way of mapping terrestrial (land) biomes around the world

While a biome can cover large areas, a microbiome is a mix of organisms that coexist in a defined space on a much smaller scale. For example, the human microbiome is the collection of bacteria, viruses, and other microorganisms that are present on or in a human body.[3]

A 'biota' is the total collection of organisms of a geographic region or a time period. from local geographic scales and instantaneous temporal scales all the way up to whole-planet and whole-timescale spatiotemporal scales. The biotas of the Earth make up the biosphere.

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