If the question is "is rib cage part of respiratory or part of skeletal system" what would be the answer

Wich is not standing in the way of astronomers getting a good view of different star

Abeaker of water was heated and then placed on a bench in the laboratory. the water cooled until it was the same temperature as the air in the laboratory. which of these explains the mechanism by which the water cooled? a. heat energy was transferred from the water to the air. b. water molecules from the water formed warm water currents. c. the water molecules absorbed energy from the molecules in the air. d. the water released radiation until it contained no heat energy.

The changes that the students observed, rapid breathing and sweating, would be classified as a to a change in a system.