Question

1. Is the trachea considered an organ? 2. Are bones organs? 3. What are rigid organs?

Answer 1

1. Trachea itself is not considered a complete organ. It is a part of the breathing system and the only airway to the lungs.

2.Yes rigid organs.

3. Rigid organs constitute part of the endoskeleton of vertebrates.

Answer 2

1. If you only consider the Trachea, it is not considered a complete organ. It is part of the respiratory system and breathing system. Some groups consider it as an organ, however, most do not. The trachea is a part of an organ. Basically, the trachea itself is not an organ. 
2. Bones are considered a rigid organ. Not only bones are organs, but they protect other organs.
3. A rigid organ is an organ that supports and protect other organs in the body and provide a stable structure for the body. This would be bones. 

Hope I helped! (: