Each species has special adaptations suited to its habitat. If this habitat is quickly changed, the organism may not be able to adapt and so it dies. Look around your neighborhood. The buildings for house and stores and the parking lots and streets cover land that was once the home of plants and animals. Those not able to find new food and shelter die out.
Extinction can also come about because of pollution.
Again, the source of this problem can be people. Chemicals dumped into waterways not only affect drinking water supplies for people but can also poison birds, fish, plants and other life forms, as well as the animals that eat these organisms. Oil spills in both fresh and marine environments threaten and have long lasting effects on the lives of many species. Polluting gases from the burning of fossil fuels affect all living organisms. Plastic and other waste items can be deadly to animals.