Which determines whether an individual animal or plan can survive?

An individual animal or plant's ability to survive is primarily determined by its adaptations to the environment, including physiological traits, behavioral strategies, and reproductive success. These adaptations enable them to acquire resources, avoid predators, and cope with environmental stresses. Additionally, genetic diversity and environmental conditions play crucial roles in survival, influencing resilience to changes and challenges. Overall, the interplay between an organism's characteristics and its environment dictates its survival prospects.