Species extinction occurs when a species no longer exists anywhere on Earth. This can happen due to various factors, including habitat loss, climate change, pollution, and overhunting. When a species goes extinct, it can disrupt ecosystems and affect other species that rely on it for food or habitat. Conservation efforts aim to protect endangered species and their habitats to prevent extinction. Organizations and governments work together to create protected areas, enforce laws against poaching, and promote sustainable practices. Notable examples of extinct species include the Passenger Pigeon and the Woolly Mammoth, highlighting the importance of biodiversity.