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Biodiversity, Ancestry, & Rate of Evolution (15.3) State Standard SB5B. Explain the history of life in terms of biodiversity, ancestry, and the rates of evolution. Chapter 15 Evolution Speciation Speciation is the formation of a ___________ species. For speciation to occur a population must ___________ and then be reproductively ___________. Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance Adaptive Radiation – AKA Divergent Evolution/Speciation Can occur in a relatively short time when one species gives rise to many different species in response to the creation of ____________ ____________ or some other ecological opportunity Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance Convergent Evolution ____________ species evolve ____________ traits because of similar environmental pressures. Chapter 15 Evolution 15.3 Natural Selection-SpeciationResistance Coevolution The relationship between two species might be so close that the evolution of one species ____________ the evolution of the other species. Associated with ____________ Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance Rate of Speciation Evolution proceeds in small, gradual steps according to a theory called ____________. ____________ ____________ explains rapid spurts of genetic change causing species to diverge quickly. Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance