Which of the following are proposed causes for the mass extinctions in Earth's history? Asteroids and comets Extreme Volcanic Activity Extreme climate changes Global flood

Option: Asteroids and comets

Explanation:

The mass extinctions in earth's history are the asteroids and comets in Earth's history. The collisions during some millions of years ago have caused many species to get extinct. Earth abundantly filled with an inhabitant of dinosaurs, ichthyosaurs, and pterosaurs, which began to get extinct with the collisions with asteroids and comets.

Asteroids and Comets is your answer.