An Organism
What Are Organs That Work Together To Preform Special Functions?
Organ system
In a body many systems work together to perform their own functions.Every system has certain body organs which work together to perform their specific functions.For example in breathing system, all organs from nose to lungs (in breathing track) work together to perform specific function of respiration.Similarly in digestive system all organs from mouth till intestine perform their function of digestion together.
The stomach, heart, brain, and lungs are all organs. An organs is a group of tissue working together. Like a tissue, an organ has a specific function. The heart, for example pumps blood throughout the body.
Organism.....? :D
Don't cheat and take a wild guess