What consist of different organs that work closely together?

The correct answer is organ systems, which are defined as groups of different organs that collaborate to perform a set of related functions necessary for the body’s overall operation. Each organ within a system is specialized for a particular role, but they work in concert to ensure that the system functions effectively. For example, the digestive system includes organs such as the stomach, intestines, and liver, all of which play important roles in breaking down food and absorbing nutrients.

Cells are the fundamental units of life but do not comprise organs or organ systems on their own. Tissues are composed of groups of similar cells that perform a specific function, while organisms refer to complete living entities that can consist of multiple organ systems. Hence, organ systems are the most fitting choice when identifying a collection of organs that work closely together.