In biological and slowly evolving alife, large-scale evolutionary trends above the species level. One mechanism is species selection, whereby species either survive or become extinct through time. Thus large-scale trends are determined by which species survive. Although some have stated that the mechanisms of micro- and macro-evolution are distinct, it is most almost always accepted that macroevolution is simply the continuation of microevolution over time. Macroevolution is thus an outcome of the interaction between microevolutionary processes operating within myriads of individual populations and species, on the one hand, and the global biospheric environments evolving on specific stable and old space or enclosed habitats or - in the case of Garden Worlds - in various continents and and oceans over millions of years, on the other.
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Text by M. Alan Kazlev
Initially published on 03 December 2001.