A species that is no longer living is referred to as "extinct." Extinction signifies that there are no remaining individuals of that species in existence. This can occur due to various factors, including habitat loss, predation, disease, and environmental changes. Extinction is a natural part of Earth's evolutionary history, but human influence has accelerated this process significantly, leading to concerns about biodiversity loss. Conservation efforts are ongoing to prevent further extinctions and protect endangered species, highlighting the importance of preserving ecosystems and natural habitats.