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Rahul kumar Best Answer
Answer: (B) Miocene-Pliocene Boundary Miocene-Pliocene boundary is not defined on any palaeontological criteria. Permian-Triassic boundary is demarcated by extinction event. Cretaceous-Tertiary boundary is also demarcated by extinction event and extinction of dinasours. Pleistocene-Holocene Boundary is demarcated by evolution of Humans.