Changes to the Enviroment:
- Changes in climate or weather mean that their habitat is destroyed and the species cannot adapt to the new area
- Eg. Wooly Mammoth
Major Catastrophic events: Eg. An asteroid/ meteor stopped sunlight entering the atmosphere so the plants couldnt grow so the dinosaurs couldnt eat
New Diseases:
- New diseases which organisms arent adapted to kill them
- Eg. Golden toad
New Predators: Eg. Humans started hunting dodos so they became extinct
New Competitors:
- A bigger/ stronger species may take the food or habitat of the first species so they cannot breed or eat
- Eg. Grey squirrels were better at finding food so red squirrels have declined
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