To put it simply, new species can form when organisms within a population become so genetically different they can no longer reproduce with one another without generating harmful mutations.
This can be caused by genetic drift and geographic isolation. Two populations of the same species who live in different parts of the world will diverge and go on separate genetic paths, until eventually the two populations become genetically different and branch off into two different species.
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A new species entering a geographical area is called and invasive species. These new species may soon take over since they may not have any natural predators, or enemies.
They both are mechanisms by which new species arise grad point
Speciation is the best term to describe a new species developing from an existing one.
Interspeciation is the process of new species evolving from species that are already in existence. An example of this would be the new designer dogs.
No, he recognised that species evolve into new species.