Cough, runny nose, inflamed eyes, sore throat, fever, and a red, skin rash.
Water had the capability to hold up the thin overhang of the underground.
When water is depleted, there is nothing to support this overhang, which eventually led to the formation of sinkholes.
As for the collective behavior, it's all because of the scarcity. Water is one of human's basic needs to survive. When water is scarce, this will force the people to compete with one another to obtain it, which will cause the behavior
Answer: Change between generations
Explanation:
Heredity involves the passing of characteristics or traits from one generation to the next. It accounts for the reason as to why offspring look like their parents.