The primary cause of species extinction is habitat loss, driven mainly by human activities such as deforestation, urbanization, and agricultural expansion. As natural habitats are destroyed or fragmented, species struggle to find food, mates, and shelter, leading to population declines. Other significant factors include climate change, pollution, overexploitation, and the introduction of invasive species. Protecting habitats and implementing sustainable practices are essential to prevent further extinctions and to preserve biodiversity for future generations.