1. Habitat destruction: This occurs when the habitat in which a species lives is destroyed or severely altered, making it impossible for the species to survive. Causes of habitat destruction include deforestation, urbanization, pollution, and climate change.
2. Overhunting or overfishing: This occurs when a species is hunted or fished at a rate that exceeds its ability to reproduce. Overhunting or overfishing can be caused by a variety of factors, including human population growth, increased demand for food or resources, and the use of unsustainable fishing or hunting practices.
3. Introduced species: These are species that are not native to a particular region and have been introduced either intentionally or unintentionally. Introduced species can compete with native species for food and resources, transmit diseases, or prey upon native species, all of which can contribute to the extinction of native species.