Extinction occurs when there are no more individuals left in a particular species.
This can occur due to a number of reasons:
⇒ Disease – a disease which wipes out a whole species.
⇒ Predator – a new predator which eats all the prey before they can reproduce.
⇒ A change in the environment – a change in temperature or climate, may reduce the chances of a particular species of surviving.
⇒ Competition – competition form another species for food and habitats will cause the other species to die out.