Question

Identify the statement that is true about mass extinctions.

Answer 1

Answer:

A. The mass extinction of dinosaurs occurred at the Cretaceous/Paleogene boundary.

Explanation:

The most known extinction is the associated with the Dinosaurs, which happened at the Cretaceous/Palogene boundary (66 million years ago), although there is still a huge discussion on the causes of such extinction (comet/asteroid, changes in sea level, volcano activity).

Such event meant the dissappearing of two-thirds of the living species on Earth.

Answer 2

Answer:

D

Explanation:

Mass extinction is defined as an occurrence that cause a rapid extinction of a large number of species across the earth within a short period of time.

Factors that causes mass extinction are change in climatic condition ,massive volcanic eruption ,and effects of asteroids.

When asteroid impact can ignite a chain of worldwide volcanic eruption which effect can lead to a mass extinction of different species of animal.