Final answer:
Homeostasis is the condition in which a system such as the human body is maintained in a more-or-less steady state. Cells, tissues, organs, and organ systems work together to maintain homeostasis by monitoring and adjusting variables within narrow ranges. This has significant importance on a whole organism level as it is vital for the survival and proper functioning of the body.
Step-by-step explanation:
Homeostasis is the condition in which a system such as the human body is maintained in a more-or-less steady state. It is the job of cells, tissues, organs, and organ systems throughout the body to maintain many different variables within narrow ranges that are compatible with life. Keeping a stable internal environment requires continuous monitoring of the internal environment and constantly making adjustments to keep things in balance.