Answer:
The ability of an individual or group to carry out a particular economic activity more efficiently than another individual or group.
Explanation:
Answer:
(B) Preoperational
Explanation:
The theory developed by the famous psychologist Jean Piaget, about the preoperational stage, describes the characteristics of reasoning during a person's age. More specifically, it is the phase of cognitive development that the child goes through between 2 and 7 years.
One reason it was a health threat is it caused teeth to become ground down which would then lead to infections. The same was true with their eyes and lungs, sand would be blown into their eyes or inhaled into their lungs and then could cause infections.
