B2 6.3 More about extinction

Learning Objectives and Key points

How does environmental change over long time scales affect living organisms?

Extinction can be caused by environmental change over geological time. Changes in the climate or the environment have been the main cause of extinction throughout history. Different species thrive and evolve in different conditions. Some like it hot others cold and if they don't get the right conditions many will become extinct through lack of food or being too cold to breed.

What caused the mass extinctions of the past?

Mass…