A group of rats placed in an air-tight box for some hours died because they
Answer Details
The group of rats placed in an air-tight box died because they used up the available oxygen in the air inside the box. Without fresh air entering the box, the rats were unable to obtain the oxygen they needed to sustain their bodily functions, such as respiration, and eventually died from lack of oxygen. This demonstrates the importance of air circulation and oxygen supply for living organisms.