Cellular telephones and life expectancy. A survey of the world’s nations in 2004 shows a strong positive correlation between percentage of the country using cell phones and life expectancy in years at birth.

Afarm grows soybean and produces chickens. the opportunity cost of producing each of these products increases as more of it is produced. draw the? farm's ppf. label it ppf0. the farm adopts a new technology which allows it to use fewer resources to fatten chickens. draw a ppf that illustrates the impact of the new technology. label it ppf1.

Describe the social and economic challenges facing the newly formed country of slovakia.

Compare and contrast the environmental consequences of reliance on coal with reliance on petroleum.