The safety chains support the trailer's coupler should it become disconnected with the towing vehicle.
Answer:
Asthma
Explanation:
The airways narrow and produce more mucus than normal which has the effects of breathing difficulty and coughing. It is a common long-term inflammatory disease of the airways in the lungs. Asthma has the effects such as wheezing, chest tightness, coughing and shortness of breath.
You need to put the picture
Answer:
Experiment is the correct answer.
Explanation: