Over the past 30 years or so,infant mortality has been cut in half and average life expectancy has increased by about 10 years or more.This is because of:

Question

Quizplus · Accepted Answer

The reduction of infant mortality and increase in average life expectancy over the past 30 years can be attributed to a combination of factors including wider availability of modern medical technology, improved sanitation, and rising incomes. Therefore, choice D, "all of the above," is the best answer.

Over the Past 30 Years or So,infant Mortality Has Been