The primary reasons for species extinction include habitat destruction, climate change, pollution, overexploitation, and the introduction of invasive species. Human activities, such as deforestation and urbanization, significantly reduce available habitats, leading to population declines. Additionally, climate change alters ecosystems and the suitability of habitats, making it difficult for some species to adapt. Overhunting, poaching, and environmental contaminants further stress populations, while invasive species can disrupt existing ecological balances, leading to further extinctions.