The types of living organisms on Earth have changed over time,new species have originated and existing species have disappeared.This is an example of:

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The process described involves the evolution of organisms on a large scale, which is known as macroevolution. Speciation refers to the formation of new species, which is a part of macroevolution, but does not encompass the entire process described. Extinction refers to the disappearance of species, which is a component of the process described, but not the entire process. Alternation of generations refers to the life cycle of certain organisms, and hybridization refers to the interbreeding of different species, neither of which are relevant to the process described.

The Types of Living Organisms on Earth Have Changed Over