An ____ species is any type of plant or animal that is in ____ of ____ forever. If a ____ or type of plant or animal dies out completely, it becomes ____. Animals and ____ depend on each other and their environment to survive. When their environment, or ____, changes or disappears, plants and animals may become ____. Natural ____ or changes in the ____ can harm or destroy habitats. ____ can cause species to become endangered as well. Humans ____ habitats with garbage, car fumes, and ____ wastes. The destroy habitats by clearing ____ for roads, buildings, and farms. They also may ____ and kill too ____ of certain types of animals. The arrival of a ____ species in a habitat is another threat. Often the new species spreads freely ____ it has no natural enemies. The species already ____ the habitat may not be able to ____ against the newcomer. For example, mongooses brought to Jamaica in the 1800s killed many ____ animals.

Why do species become endangered?

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