This document discusses environmental factors and how organisms adapt to their environments. It defines ecological factors as characteristics of the environment that affect living things, and adaptations as how organisms evolve to survive in specific environments, including morphological, physiological, and behavioral adaptations. It provides examples of adaptations to conditions like water scarcity, temperature changes, sunlight, salt concentration, lack of oxygen, and lack of food. The document also discusses populations as groups of the same species that inhabit the same area and reproduce together. It describes population dynamics, including biotic potential and population growth strategies. Finally, it defines communities as sets of populations that live together in the same habitat, and discusses diversity, ecological succession, and relationships within communities.