Question

1. what is the key difference between \life expectancy\ and \lifespan\? (1 point) a) life expectancy is a statistical average for a group, while lifespan is the maximum age an individual can reach. b) life expectancy is a universal constant, while lifespan varies by individual. c) life expectancy is for males, and lifespan is for females. d) life expectancy and lifespan are synonymous and can be used interchangeably 52. life expectancy at birth is heavily influenced by which of the following factors, especially in historical data? (1 point) a) adult death rates from chronic diseases. b) infant and child mortality rates. c) the economic prosperity of a countrys wealthiest citizens. d) the availability of advanced medical technology for the elderly.

Explanation:

For question 51, life expectancy is calculated as an average for a group (e.g., a population of a country), while lifespan refers to the maximum age an individual can attain. For question 52, in historical data, infant and child mortality rates had a significant impact on life - expectancy at birth as a large number of deaths in early life greatly affected the overall average.

Answer:

1. a) Life expectancy is a statistical average for a group, while lifespan is the maximum age an individual can reach.
2. b) Infant and child mortality rates.