That depends on what type of organism you're talking about. Fish don't have lungs, but mammals, eg. cows, dogs and people, need lungs to breathe. So yes they are essential if you want to breathe air like a mammal, reptile or bird, but not if you have gills like a fish.
lungs is respiratory organ of cow
The lungs are their own organ but they are located in the thoracic cavity
The lungs are the main organ of the respiratory system, but they are also an organ in the circulatory system.
The lungs are the saclike organ in amphibians that take in oxygen from the air. Oxygen is then transferred from the lungs to the bloodstream through a process called respiration. This allows the amphibian to breathe and obtain the necessary oxygen for metabolic processes.
The heart is surrounded by the lungs.
diaphragm the lungs
You need lungs to breathe.
The lungs
The organ responsible for breathing is your lungs.
The Bronchi is not an Organ. An Organ is tissues that carry out a human process, Bronchi is in the Lungs, so the Bronchi helps the lung carry out respiration.
No
The Lungs.