Biocycles

(or life regions), the three most important subdivisions of the biosphere: dry land, the sea, and inland waters. Each biocycle is subdivided into biochores, which include a significant number of biotopes. For example, biotopes of sandy, clayey, and rocky deserts unite to form the desert biochore, which—together with forest, steppe, and other biocycles—makes up the dry-land biocycle. The term “biological cycles” is used in ecology in a different sense.