A specified set up of internal environment at various levels of organization suitable to its surroundings, have been assumed by each organism of a species in :

Explanation

Homeostasis refers to the ability of an organism to maintain a stable internal environment despite changes in the external surroundings. It involves various physiological processes and feedback mechanisms that enable organisms to regulate factors like body temperature, pH levels, nutrient balance, and water balance. Adaptation refers to the process by which organisms develop traits suited to their environment over time. Evolution refers to the gradual change in inherited traits of a population over successive generations. Reproduction pertains to the production of offspring by an organism. Among the given options, homeostasis best describes the specified set up of the internal environment suitable to its surroundings assumed by each organism of a species.