An organism is a single, living thing and can be an animal, a plant, or a fungus. Organisms grow and respond to their environment. A population is a term we use to describe multiple individuals or organisms of a single species that live within a particular geographic area. Organisms and Population briefly describe organisms and their environment, different abiotic factors, response to these factors, adaptations, Population, population growth, and much more. An organism refers to a contiguous living system that lives in an environment and can adapt and retain specific structure and behaviour. The Population forms a community which operates the ecosystem. The ecosystem consists of both biotic and abiotic factors. Major abiotic factors which lead to variation in the physical and chemical conditions of different habitat are temperature, water, light, and soil.