Verified Answer :

When geologists refer to the Big Five, they are referring to the five different events of extinction in history. Cretaceous-Paleogene, Triassic-Jurassic, Permian-Triassic, Late Devonian and Ordovician-Silurian.

Answer:

The five largest mass extinctions in Earth's history.

Explanation:

The Big Five is the term used for the 5 mass extinctions that took place during the course of Earth's history.

These big five mass extinctions were :

  1. End-Ordovician
  2. Late Devonian
  3. End-Permian
  4. End-Triassic
  5. End-Cretaceous

These extinctions are really significant because they impacted the population of organisms found in those specific times drastically and also led to the evolution of new species.

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