Social agreement: It means that the relationship between a form and the meaning it represents is jointly identified and followed by members of the society, and there is no necessary connection between the two. which of the following are social conventions? ['Zaoxia does not go out, Wanxia travels thousands of miles.', 'Car debris scattered on the highway means a car accident has occurred.', 'Red and green represent the rise and fall of the stock index in the domestic stock market, respectively.', "The person's face is waxy yellow, indicating that the body may have a certain disease."]