Final answer:
The living organism can be described as a network of systems interrelated through connective tissue.
Step-by-step explanation:
The phrase that describes the living organism as a network of systems interrelated through connective tissue is D. system. In multicellular organisms, several cells of one particular kind interconnect with each other and perform shared functions to form tissues, several tissues combine to form an organ, and several organs make up an organ system. Several systems functioning together form an organism.