Mass extinctions have occurred five times in Earth's history. The end Permian and Cretaceous extinctions were responsible for removing a large percentage of organisms from the planet. How do these extinctions contribute to the biodiversity we see today?

Answer: Extinctions greatly shape the biodiversity we see.

Explanation:

Mass Extinctions occurs when some massive climatic and natural conditions wipes away a certain specie of living organism.

Mass extinction is believed to be the reason why many animals can't be seen on Earth today, animals such as: dinosaurs, mammoth, Tasmanian tiger, West African Black Rhinoceros, dodo have all gone extinct.

Therefore Extinctions greatly shape the biodiversity we see today, and humans are saddled with the responsibility of preserving our current biodiversity we have.