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The concept that the species have changed over a long period of time is known as
Ecosystem
Spontaneous generation
Organic evolution
Genetic recombination
Solution
Organic evolution (biology) is the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms.
Organic evolution includes the two major processes
Anagenesis, the alteration of the genetic properties of a single lineage over time and Cladogenesis, or branching, whereby a single lineage splits into two or more distinct lineages.
Emergent Evolution The appearance of entirely new properties at certain critical stages in the course of evolution
Macro Evolution It occurs on a large scale extending over geologic era and results in the formation of new taxonomic groups
Micro Evolution It results from small specific genetic changes that may to the formation of new sub-species
Biological Process (organic process) is a process occurring in living organisms
Speciation It is the evolution of a biological species