Natural Selection 
Barryl


Natural Selection is part of the Biological Evolution process. Genetic permutations caused by chance,climatic and catastrophic factors, etc., determine the quality of the offspring ( and may be variations of it,  such as mutations, which may result in new species) of/from an organism. Natural selection determines what stays and continue to pro-create = successful adaptation of the organism to the environment at the time of prevailing conditions in the biosphere). As biospheric conditions are not constant over very long periods,  means that organisms may be severely stressed to adapt (selection) or die (become extinct).  Catastrophic phenomena are part of Nature and so is human intervention - good and bad.