Which term describes the coordinated activities of multiple organs?

The correct term that describes the coordinated activities of multiple organs is "system." A system, such as the circulatory system or digestive system, is composed of various organs working together to perform specific functions that support the overall performance of the body. Each organ within a system contributes to a common goal, enabling more complex functions than any single organ could achieve on its own.

In contrast, an organism refers to an individual living entity composed of many systems, tissues are groups of similar cells that perform specific functions, and cells are the basic building blocks of all living organisms. While tissues and cells are important components of organs and systems, they do not encompass the coordinated interaction between multiple organs, which is what a system specifically denotes.