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