Final answer:
The structural organization level consisting of groups of cells that work together is the tissue level.
Step-by-step explanation:
The level of structural organization that consists of groups of cells that work together to do a similar job is called the tissue level. This organization is crucial for the complex functioning of multicellular organisms. Similar cells collaborate to form tissues, which are then organized into organs, each performing a specific function within the body. The human body, for instance, comprises various types of tissues, each with a distinct role, such as muscle, epithelial, connective, and nervous tissues.