Final answer:
Respiratory illnesses are diseases that affect the respiratory system, which includes the lungs, bronchial tubes, trachea, nose, and throat. They can be caused by bacteria, viruses, environmental pollutants, or poor lifestyle choices such as smoking.
Step-by-step explanation:
Respiratory illnesses are diseases that affect the respiratory system, which includes the lungs, bronchial tubes, trachea, nose, and throat. These illnesses can range from a common cold to more severe conditions like pneumonia. They can be caused by bacteria, viruses, environmental pollutants, or poor lifestyle choices such as smoking. Examples of respiratory illnesses include asthma, bronchitis, and emphysema.
Keywords: respiratory illnesses, respiratory system, lungs, bronchial tubes, trachea, nose, throat, bacteria, viruses, environmental pollutants, smoking, asthma, bronchitis, emphysema