Relier Pairs Levels of organization LTVersion en ligne Match the definition with the level of organization's name. par Laura Quiroga Sánchez 1 Basic unit of structure and function in an organism. 2 Entire living thing that carries out all basic life functions. 3 Group of one or more Organs working together to perform functions for the organism. 4 Made of several cells similar in structure and function that work together to perform a specific job. 5 Made of similar tissues that work together to perform a specific activity or job. ORGAN ORGANISM ORGAN SYSTEM CELL TISSUE